@string{PRB = "Phys. Rev. B"}
@string{PRA = "Phys. Rev. A"}
@string{JPC1 = "J. Phys. C: Solid State Phys."}
@string{JPA = "J. Phys. A: Math. Gen."}
@string{JPB = "J. Phys. B: At. Mol. Phys."}
@string{JPF = "J. Phys. F: Met. Phys."}
@string{AP = "Adv. Phys."}
@string{JAP = "J. Appl. Phys."}
@string{JAC = "J. Alloys Compd."}
@string{MP = "Mol. Phys."}
@string{JMMM = "J. Mag. Mag. Materials"}
@string{PPS = "Proc. Phys. Soc."}
@string{PRS = "Proc. Roy. Soc."}
@string{PRL = "Phys. Rev. Lett."}
@string{JCP = "J. Chem. Phys."}
@string{JPCS = "J. Phys. Chem. Solids"}
@string{JL = "J. Luminescence"}
@string{JMP = "J. Math. Phys."}
@string{RMP = "Rev. Mod. Phys."}
@string{PR = "Phys. Rev."}
@string{JPC2 = "J. Phys.: Condens. Matter"}
@string{PL = "Phys. Lett."}
@string{PSSb = "Phys. Stat. Sol. (b)"}
@string{PSSa = "Phys. Stat. Sol. (a)"}
@string{pssb = "Phys. Stat. Sol. (b)"}
@string{pssa = "Phys. Stat. Sol. (a)"}
@string{CPL = "Chem. Phys. Lett."}
@string{AJP = "Austral. J. Phys."}
@string{SSC = "Solid State Commun."}
@string{SPSS = "Soviet Phys.: Solid State"}
@string{ZPB = "Z. Phys. B"}
@string{ZP  = "Z. Phys."}

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author = "W. A. Harrison",
title = "Pseudopotentials in the theory of metals",
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author = "M. Tinkham",
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author = "W. H. Press and B. P. Flannery and S. A. Teukolsky and
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author = "J. W. Leech and D. J. Newman",
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author = "L. M. Falicov",
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author = "M. Sachs",
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author = "J. C. Slater",
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author = "P. H. Butler",
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author = "D. M. Brink and G. R. Satchler", 
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author = "M. Rotenberg and R. Bivins and N. Metropolis and J. K. Wooten Jr", 
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author = "Volker Heine",
title = "Group theory in quantum mechanics",
publisher = "Pergamon Press",
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author      = "R. D. Cowan",
title       = "The theory of atomic structure and spectra",
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author = "G. H. Dieke",
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@PhdThesis{Cro98,
  author =  "S. M. Crooks",
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author = "H. Watanabe",
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author = "B. R. Judd",
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author = "J. S. Griffith",
title = "The irreducible tensor method for molecular symmetry groups",
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author = "J. S. Griffith",
title = "The theory of transition metal ions",
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author = "Tang Au-Chin",
title = "Theoretical method of ligand field chemistry",
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title = "Ligand-field parameters",
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year = 1963
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@book{Wyb65,
author = "B. G. Wybourne",
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volume = "{\bf 43}",
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year = 1966,
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@ARTICLE{Wyb68,
 author="B. G. Wybourne",
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volume=	"{\bf 16}",
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title = "Investigation into the origin of crystalline electric field effects on rare earth ions
{I. C}ontribution from neighbouring induced moments",
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volume = "{\bf 81}",
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@article{AMS72,
author = "I. B. Aizenberg and B.Z. Malkin and A. L. Stolov",
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         of the fluorite type",
year = 1972,
volume = "{\bf 13}", 
pages = " 2155--2158"
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@article{CC83,
author = "W. T. Carnall and H. Crosswhite",
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journal = "J. Less Common Met.",
volume = "{\bf 93}", 
pages = " 127--135"
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@article{CCER77,
author = "H. M. Crosswhite and H. Crosswhite and N. Edelstein and K. Rajnak",
title = "Parametric energy 
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journal = JCP,
volume = "{\bf 67}",
pages = " 3002--3010"
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@article{Eis63a,
author = "J. C. Eisenstein",
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year = 1963,
journal = JCP,
volume = "{\bf 39}",
pages = " 2134--2140"
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@article{Eis63c,
author = "J. C. Eisenstein",
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journal = JCP,
volume = "{\bf 40}",
pages = " 2044"
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@article{Eis63b,
author = "J. C. Eisenstein",
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journal = JCP,
volume = "{\bf 39}",
pages = " 2128--2133"
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@article{DD63,
author = "L. G. DeShazer and G. H. Dieke",
title = "Spectra and energy levels of {Eu$^{3+}$} in {LaCl$_3$}",
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journal = JCP,
volume = "{\bf 38}",
pages = " 2190--2199"
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@article{AD62,
author = "J. D. Axe and G. H. Dieke",
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         of {$J$} mixing",
year = 1962,
journal = JCP,
volume = "{\bf 37}",
pages = "$\> $ 2364--2371"
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@article{KD66,
author = "N. H. Kiess and G. H. Dieke",
title = "Energy levels of {Er$^{3+}$}
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journal = JCP,
volume = "{\bf 45}",
pages = " 2729--2734"
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@article{CFFW76,
author = "A. K. Cheetham and B. E. F. Fender and H. Fuess and A. F. Wright",
title = "A powder neutron 
diffraction study of lanthanum and cerium trifluorides",
year= 1976,
journal =  "Acta Cryst. B",
volume = "{\bf  32}",
pages = " 94--97", 
}

@article{CGRR89,
author = "W. T. Carnall and G. L. Goodman and K. Rajnak and R. S. Rana",
title = "A systematic analysis of the
spectra of the lanthanides doped into single crystal {LaF$_3$}",
year = 1989,
journal = JCP,
volume = "{\bf 90}",
pages= " 3443--3457"}                     

@article{Car92,
author = "W. T. Carnall",
title = "A systematic analysis of the
spectra of trivalent actinide chlorides in {D}$_{3h}$ site symmetry",
year = 1992,
journal = JCP,
volume = "{\bf 96}", 
pages= " 8713--8726"}

@article{LBH93,
author = "G. K. Liu and J. V. Beitz and J. Huang",
title = "Ground-state splitting of {S}-state ion {C}m$^{3+}$ 
          in {LaCl}$_3$",
year = 1993,
journal = JCP,
volume = "{\bf 99}", 
pages= " 3304--3311",
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@article{LCJCH94,
author = "G. K. Liu and W. T. Carnall and R. C. Jones
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title = "Electronic energy level structure of {Tb}$^{3+}$ 
          in {LiYF}$_4$",
year = 1994,
journal = "J. Alloys Compd.",
volume = "{\bf 207--208}", 
pages= " 69--73",
}

@article{CLWR91,
author = "W. T. Carnall and G. K. Liu and C. W. Williams and M. F. Reid",
title = "Analysis of the crystal-field spectra
of the actinide tetrafluorides. {I}. {UF}$_4$, {NpF}$_4$ and {PuF}$_4$",
year = 1991,
journal = JCP,
volume = "{\bf 95}", 
pages= " 7194--7203",
}

@article{AM83,
author =  "F. Auzel and O. L. Malta",
journal= JPC1,
title =  "A scalar crystal field strength parameter for rare-earth ions: 
meaning and usefulness",
year = 1983,
volume = "{\bf 44}",
pages = " 201--206"
}

@InCollection{Auz84,
  author = 	 "F. Auzel",
  booktitle = 	 "Energy transfer processes in condensed matter",
  title =	 "A scalar crystal field strength parameter for rare-earth ions",
  publisher =	 "Plenum {P}ress",
  address  =  "London",
  year =	 1984,
  editor =	 "B. Di Bartolo",
  pages =	 " 511--520"
}

@article{BHMSC83,
author = "P. Blanchfield and T. Hailing and A. J. Miller and
         G. A. Saunders and B. Chapman",
journal = JPC1,
title = "Vibrational anharmonicity of oxide and fluoride" ,
year = 1983,
volume = "{\bf 20}",
pages = " 3851--3858"
}


@InCollection{CBCRM83,
  author = 	 "W. T. Carnall and J. V. Beitz and H. Crosswhite and K. Rajnak
                  and J. B. Mann",
  booktitle = 	 "Systematics and the properties of the lanthanides",
  title =	 "Spectroscopic properties of the f-elements in compounds and solutions",
  publisher =	 "D. Reidel",
address = "Amsterdam",
  year =	 1983,
  editor =	 "S. P. Sinha",
  pages =	 " 389-450"
}

@article{CCJ68,
author = "H. Crosswhite and H. M. Crosswhite and B. R. Judd",
title =  "Magnetic parameters for the configuration $f^3$",
year = 1968,
journal = PR,
volume  = "{\bf 174}",
pages = " 89--94"}

@article{Mar47,
author = "H. H. Marvin",
title =  "Mutual magnetic interactions of electrons",
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journal = PR,
volume  = "{\bf 71}",
pages = " 102--110"}

@article{CJ70,
author = "H. Crosswhite and B. R. Judd",
title = "Reduced matrix elements of two-electron double-vector 
         operators for $f^4$ and $f^5$", 
year = 1970,
journal = "Atomic Data",
volume = "{\bf 1}", 
pages = " 329--357"}

@article{Cro77,
author = "H. M. Crosswhite",
title = "Systematic atomic and crystal-field parameters for lanthanides in 
         {LaCl$_3$} and {LaF$_3$}", 
year = 1977,
journal = "Colloques Internationaux du Centre National de la Recherche 
            Scientifique",
volume = "{\bf 255}", 
pages = " 65--69"}

@article{CC84,
author = "H. Crosswhite and H. M. Crosswhite", 
title = "Parametric model for $f$-shell configurations. {I. T}he 
        effective-operator Hamiltonian", 
year = 1984,
journal =  "J. Opt. Soc. Am. B",
volume = "{\bf 1}", 
pages = " 246--254"}

@article{DZKKS77,
author = "M. P. Davidova and S. B. Zdanovitch and B. N. Kazakov and
          S. L. Koralev, and A. L. Stolov",
title = "Stark structure of the spectrum of the {Dy$^{3+}$} ion in a {LiYF$_4$} crystal",
year = 1977,
journal = "Opt. Spectrosc.", 
volume = "{\bf 42}", 
pages = " 327--328"}

@article{EBAWML79,
author = "L. Esterowitz and F. J. Bartoli and R. E. Allen and
           D. E. Wortman and C. A. Morrison and R. P. Leavitt",
title = "Energy Levels and Line Intensities of {Pr$^{3+}$} in {LiYF$_4$}", 
year = 1979,
journal = PRB,
volume = "{\bf 19}", 
pages = " 6442--6455"}

@article{GBPML85,
author = "C. G{\"o}rller-Walrand and M. Behets and P. Porcher 
            and O. K. Moune-Minn and I. Laursen", 
title = "Analysis of the Fluorescence Spectrum of {LiYF$_4$:Eu$^{3+}$}", 
year = 1985,
journal = "Inorganica Chimica Acta", 
volume = "{\bf 109}",
pages= " 83--90"}

@InCollection{GB96,		   
  author = 	 "C. G{\"o}rller-Walrand and K. Binnemans",
  booktitle = 	 "Handbook on the Physics and Chemistry of Rare Earths",
  title =	 "Rationalization of crystal--field parameterization",
  publisher =	 "North-Holland",
  year =	 1996,
  editor =	 "K. A. Gschneidner Jr and L. Eyring",
  volume = "{\bf 23}",
  pages =	 " 121--283",
  address =	 "Amsterdam"}

@article{HJC96,
author = "J. E. Hansen and B. R. Judd and H. Crosswhite",
title =  "Matrix elements of scalar three-electron 
operators for the atomic $f$ shell",
year = 1996,
journal = "Atomic Data and Nuclear Data Tables",
volume = "{\bf 62}",
pages = " 1--49"}   

@article{Kas70,
author = "A. J. Kassman", 
title = "Relationship between the coefficients of the tensor operator and 
         operator equivalent methods", 
year = 1970,
journal =  JCP,
volume = "{\bf 53}", 
pages = " 4118-4119"}

@article{Kru87,
author = "J. C. Krupa", 
title = "Spectroscopic properties of tetravalent actinide ions in solids", 
year = 1987,
journal =  "Inorg. Chi. Acta",
volume = "{\bf 139}", 
pages = " 223--241"}

@article{MIA70,
author = "B. Z. Malkin and Z. I. Ivanenko and I. B. Aizenberg", 
title = "Crystal field in uniaxially compressed {MeF$_2$:Ln} crystals", 
year = 1970,
journal =  "Sov. Phys. -Solid State",
volume = "{\bf 12}", 
pages = " 1491--1496"}

@article{Mar70,
author = "H. H. Marvin", 
title = "Mutual magnetic interactions of electrons", 
year = 1947,
journal =  PR,
volume = "{\bf 71}", 
pages = " 102--110"}

@article{Mor68,
author = "B. Morosin", 
title = "Crystal Structure of Anhydrous Rare--Earth Chlorides", 
year = 1968,
journal =  JCP,
volume = "{\bf 49}", 
pages = " 3007--3012"}

@InCollection{Mal87,		   
  author = 	 "B. Z. Malkin",
  booktitle = 	 "Spectroscopy of Solids Containing Rare Earth Ions",
  title =	 "Crystal field and electron-phonon interaction
                  in rare-earth ionic paramegnets",
  publisher =	 "North-Holland",
  year =	 1987,
  editor =	 "A. A. Kaplyanskii and R. M. Macfarlane",
  pages =	 " 13--50",
  address =	 "Amsterdam"}

@InCollection{ML82,
author =  "C. A. Morrison  and R. P. Leavitt",
booktitle = "Handbook  on  the physics  and  chemistry  of  rare earths",
title =  "Spectroscopic properties of triply ionized lanthanides in 
transparent host crystals",
editor = "K. A. Gschneider Jr and L. Eyring",
volume = "5",
chapter = 46,
year =1982, 
publisher = "North-Holland",
pages = " 461--692",
address = "Amsterdam"
}

@article{SW79,
author = "M. B. Seelbinder and J. C. Wright", 
title = "Site-selective spectroscopy of {CaF$_2$}:{Ho$^{3+}$}",  
year = 1979,
journal =  PRB,
volume = "{\bf 20}", 
pages = " 4308--4320"}

@article{TW87,
author = "B. M. Tissue and J. C. Wright", 
title = "Site-selective laser spectroscopy of {CaF$_2$}:{Pr$^{3+}$} and 
{CaF$_2$}:{Pr$^{3+}$},{R$^{3+}$} ({R$^{3+}=$Y$^{3+}$, Gd$^{3+}$, Nd$^{3+}$})", 
year = 1987,
journal =  PRB,
volume = "{\bf 36}", 
pages = " 9781--9789"}

@article{Url77,
author = "W. Urland", 
title = "The application of the Angular Overlap Model in the
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year = 1977,
journal =  CPL,
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pages = " 457--460"}

@article{Url78,
author = "W. Urland", 
title = "The interpretation of the Crystal Field Parameters for $f^n$ Electron
         Systems by the Angular Overlap Model. {R}are-Earth Ions in {LaCl$_3$}",
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journal =  CPL,
volume = "{\bf 53}", 
pages = " 296--299"}

@article{Url81,
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          R. Marsolais and P. Untern{\"a}hrer", 
title = "A neutron spectroscopic comparison of the crystalline electric
         field in tetragonal {HoBa$_2$Cu$_3$O$_{6.2}$} and
	 orthorhombic {HoBa$_2$Cu$_3$O$_{6.8}$}",
year = 1989,
journal = "Physica C", 
volume = "{\bf 157}",
pages = "58--64"
}

@article{FBU88a,
author = "A. Furrer and P. Br{\"u}esch and P. Untern{\"a}hrer", 
title = "Crystalline electric field in {HoBa$_2$Cu$_3$O$_{7-\delta}$}
          determined by inelastic neutron scattering",
year = 1988,
journal = SSC, 
volume = "{\bf 67}",
pages = "69--73"
}

@article{FBU88,
author = "A. Furrer and P. Br{\"u}esch and P. Untern{\"a}hrer", 
title = "Neutron spectroscopic determination of the crystalline
         electric field in {HoBa$_2$Cu$_3$O$_{7-\delta}$}",
year = 1988,
journal = PRB, 
volume = "{\bf 38}",
pages = "4616--4623"
}

@article{HF98,
author = "W. Henggeler and A. Furrer", 
title = "Magnetic excitations in rare-earth-based 
        high-temperature superconductors",
year = 1998,
journal = JPC2, 
volume = "{\bf 10}",
pages = "2579--2596"
}

@article{KDMEH97,
author = "M. Karbowiak and J. Drozdzynski and K. M. Murdoch and
N. M. Edelstein and S. Hubert",
journal = JCP,
title = "Spectroscopic studies and crystal-field analysis of {U}$^{3+}$ ions in 
         {RbY}$_2${C}l$_7$ single crystals",
year = 1997,
volume = "{\bf 106}",
pages = "3067--3077",
}

@article{MCSKHIE98,
author = "K. M. Murdoch and R. Cavellec and E. Simoni and M. Karbowiak 
and S. Hubert and M. Illemassene and N. M. Edelstein",
journal = JCP,
title = "Laser spectroscopy and crystal field analysis of {Cm}$^3+$
         diluted in {C}s$_2${NaYC}l$_6$",
year = 1998,
volume = "{\bf 108}",
pages = "6353--6361",
}

@article{IMEK97,
author = "M. Illemassene and K. M. Murdoch and
N. M. Edelstein and J. C. Krupa",
journal = JL,
title = "Optical spectroscopy and crystal field analysis of {C}m$^{3+}$ in 
         {L}a{C}l$_3$",
year = 1997,
volume = "{\bf 75}",
pages = "77--87",
}

@article{SMEBA95,
author = "J. Sytsma and K. M. Murdoch and
N. M. Edelstein and L. A. Boatner and M. M. Abraham",
journal = PRB,
title = "Spectroscopic studies and crystal-field analysis of {Cm$^{3+}$} and 
         {Gd$^{3+}$} in {LuPO$_4$}",
year = 1995,
volume = "{\bf 52}",
pages = "12$\, $668--12$\, $676",
}

@article{MEBA96,
author = "K. M. Murdoch and
N. M. Edelstein and L. A. Boatner and M. M. Abraham",
journal = JCP,
title = "Excited state absorption and fluorescence
         line narrowing studies of {Cm$^{3+}$} and 
         {Gd$^{3+}$} in {LuPO$_4$}",
year = 1996,
volume = "{\bf 105}",
pages = "2539--2546"}

@article{KEAB93,
author = "K. Kot and N. M. Edelstein and M. M. Abraham and L. A. Boatner",
journal = PRB,
title = "Zero-field splitting of {Cm$^{3+}$}:{LuPO$_4$} single crystals",
year = 1993,
volume = "{\bf 48}",
pages = "12$\,$704--12$\,$712"}

@article{THE94,
author = "P. Thouvenot and S. Hubert and
N. Edelstein",
journal = PRB,
title = "Spectroscopic study and crystal-field analysis of {Cm$^{3+}$} 
         in the cubic-symmetry site of {ThO$_2$}",
year = 1994,
volume = "{\bf 50}",
pages = "9715--9720"}

@article{HE97,
author = "Yukio Hinatsu and Norman Edelstein",
journal = JAC,
title = "Electron paramagnetic resonance spectra of {Pr$^{4+}$} ions doped in
         {BaMO$_3$ (M =Ce, Zr, Sn} and {SrCeO$_3$}",
year = 1997,
volume = "{\bf 250}",
pages = "400--404"}

@article{HE94,
author = "Yukio Hinatsu and Norman Edelstein",
journal = JSSC,
title = "Electron paramagnetic resonance spectrum of {Pr$^{4+}$} in
         {BaCeO}$_3$",
year = 1994,
volume = "{\bf 112}",
pages = "53--57"}

@article{MEPAF97,
author = "O. K. Moune and 
N. Edelstein and B. Piriou and M.-G. Alves and M. D. Faucher",
journal = JAC,
title = "Optical absorption spectrum,
        oscillator strengths, magnetic splitting factors and
        paramagnetic susceptibility of {Nd$^{3+}$} doped into
          {LiYO$_2$}",
year = 1997,
volume = "{\bf 250}",
pages = "310--315"}

@article{Ede95,
author = "N. M. Edelstein",
journal = JAC,
title = "Comparison of the electronic 
          structure of the lanthanides and actinides",
year = 1995,
volume = "{\bf 223}",
pages = "197--203",
}

@article{JCC68,
author = "B. R. Judd and H. M. Crosswhite and H. Crosswhite",
journal = PR,
title = "Intra-atomic magnetic interactions for $f$ electrons",
year = 1968,
volume = "{\bf 169}",
pages = "130--138"}

@article{JC84,
author = "B. R. Judd and H. Crosswhite",
journal = "J. Opt. Soc. Amer. B",
title = "Orthogonalized operators for the $f$ shell",
year = 1984,
volume = "{\bf 1}",
pages = "255--260"}

@article{JS84,
author = "B. R. Judd and M. A. Suskin",
journal = "J. Opt. Soc. Amer. B",
title = "Complete set of orthogonal scalar operators for the 
         configuration $f^3$",
year = 1984,
volume = "{\bf 1}",
pages = "261--265"}

@article{JL96,
author = "B. R. Judd and E. Lo",
journal = "Atomic Data and Nuclear Data Tables",
title = "Factorization of the matrix elements of three-electron operators used 
in configuration-interaction studies of the atomic {\it f} shell",
year = 1996,
volume = "{\bf 62}",
pages = "51--75"}

@article{Jud79a,
author = "B. R. Judd",
journal = "J. Luminesc.",
title = "Correlation crystal fields for rare earths and actinides",
year = 1979,
volume = "{\bf 18/19}",
pages = "604--608",
}

@InCollection{Jud88,
  author = 	 "B. R. Judd",
  title = 	 "Atomic theory and optical spectroscopy",
  booktitle =	 "Handbook on the physics and chemistry of rare earths",
  publisher =	 "North-Holland",
  year =	 1988,
  editor =	 "K. A. Gschneidner Jr and L. Eyring",
  volume =	 "{\bf 11}",  
  pages =	 "81--195",
  address =	 "Amsterdam"}

@article{Jud62,
author = "B. R. Judd",
journal = PR,
title = "Optical absorption intensities of rare-earth ions",
year = 1962,
volume = "{\bf 127}",
pages = "750--761"}

@Article{Jud66,
  author = 	 {B. R. Judd},
  title = 	 {Hypersensitive transitions in rare earth ions},
  journal = 	 {J. Chem. Phys.},
  year = 	 {1966},
  volume =	 "{\bf 44}",
  pages =	 {839-840}}

@article{Jud77,
author = "B. R. Judd",
journal = PRL,
title = "Correlation crystal fields for lanthanide ions",
year = 1977,
volume = "{\bf 39}",
pages = "242--244",
}

@article{Jud77a,
author = "B. R. Judd",
journal = JCP,
title = "Ligand field theory for actinides",
year = 1977,
volume = "{\bf 66}",
pages = "3163--3170",
}

@article{Ofe62,
author = "G. S. Ofelt",
journal = JCP,
title = "Intensities of crystal spectra of rare-earth ions",
year = 1962,
volume = "{\bf 37}",
pages = "511--520",
}

@article{Tra63,
author = "G. T. Trammell",
journal = PR,
title = "Magnetic ordering properties of rare-earth
ions in strong cubic crystal fields",
year = 1963,
volume = "{\bf 131}",
pages = "932--948",
}

@article{HP78,
author = "W. G. Harter and C. W. Patterson and F. J. da Paixao",
journal = RMP,
title = "Frame transformation relations and multipole transitions in
symmetric polyatomic molecules",
year = 1978,
volume = "{\bf 50}",
pages = "37--83",
}

@article{HP79,
author = "W. G. Harter and C. W. Patterson",
journal = JMP,
title = "Asymptotic eigensolution of fourth and sixth rank octahedral tensor
         operators",
year = 1979,
volume = "{\bf 20}",
pages = "1452--1459"}

@article{PS71,
author = "E. Pytte and K. W. H. Stevens",
journal = PRL,
title = "Tunneling model of phase changes in tetragonal rare-earth
crystals",
year = 1971,
volume = "{\bf 27}",
pages = "862--865"}

@article{NC71,
author = "D. J. Newman and G. E. Stedman",
journal = JPCS,
title = "Analysis of the crystal field in rare-earth 
   substituted oxysulphide and vanadate systems",
year = 1971,
volume = "{\bf 32}",
pages = "535--542"}

@article{EN66,
author = "M. M. Ellis and D. J. Newman",
journal = PL,
title = "The crystal field of {PrCl$_3$}",
year = 1966,
volume = "{\bf 21}",
pages = "508--510"}

@article{NE66,
author =  "D. J. Newman and M. M. Ellis",
journal = PL,
title = "Covalency in the rare-earth trichlorides",
year = 1966,
volume = "{\bf 23}",
pages = "46--47"}

@article{BN67,
author = "M. I. Bradbury and D. J. Newman",
journal = CPL,
title = "Ratios of crystal field parameters in rare-earth salts",
year = 1967,
volume = "{\bf 1}",
pages = "44--45"}

@article{EN67,
author = "M. M. Ellis and D. J. Newman",
journal = JCP,
title = "Crystal field in rare-earth trichlorides {I. Overlap and exchange}",
year = 1967,
volume = "{\bf 47}",
pages = "1986--1993"
}

@article{BEN67,
author = "S. S. Bishton, M. M. Ellis, D. J. Newman and J. Smith",
journal = JCP,
title = "Crystal field in rare-earth trichlorides II. Exchange 
         charge effects in {PrCl$_3$}",
year = 1967,
volume = "{\bf 47}",
pages = "4133--4136"
}

@article{BN67,
author = "S. S. Bishton and D. J. Newman",
journal = JPCS,
title = "A diagram method in {MO--LCAO} crystal field theory",
year = 1967,
volume = "{\bf 29}",
pages = "1245--1253"
}

@article{NB68,
author = "D. J. Newman and S. S. Bishton",
journal = CPL,
title = "Theory of the correlation crystal field",
year = 1968,
volume = "{\bf 1}",
pages = "616--618"
}

@article{New68,
author = "D. J. Newman",
journal = CPL,
title = "Linked cluster theorem for non-orthogonal wavefunctions",
year = 1968,
volume = "{\bf 1}",
pages = "684--686"
}

@article{EN68,
author = "M. M. Ellis and D. J. Newman",
journal = JCP,
title = "Crystal field in rare-earth trichlorides. III Charge penetration
and covalency contributions in {PrCl$_3$}",
year = 1968,
volume = "{\bf 49}",
pages = "4037--4043"
}

@article{NC69,
author = "D. J. Newman and M. M. Curtis",
journal = JPCS,
title = "Crystal field in rare-earth fluorides. {I. Molecular orbital 
         calculation of {PrF$_3$} parameters}",
year = 1969,
volume = "{\bf 30}",
pages = "2731--2737"
}

@article{CNS69,
author = "M. M. Curtis and D. J. Newman and G. E. Stedman",
journal = JCP,
title = "Crystal field in rare-earth trichlorides. {IV. Parameter variations}",
year = 1969,
volume = "{\bf 50}",
pages = "1077--1085"
}

@article{NS69,
author = "D. J. Newman and G. E. Stedman",
journal = JCP,
title = "Interpretation of crystal field parameters in the 
        rare-earth-substituted garnets",
year = 1969,
volume = "{\bf 51}",
pages = "3013--3023"
}

@article{New69,
author = "D. J. Newman",
journal = JPCS,
title = "Second quantized formalism for non-orthogonal states",
year = 1969,
volume = "{\bf 30}",
pages = "1709--1718"
}

@article{CN70,
author = "M. M. Curtis and D. J. Newman",
journal = JCP,
title = "Crystal field in rare-earth trichlorides. {V}. {E}stimation
        of ligand-ligand overlap effects",
year = 1970,
volume = "{\bf 52}",
pages = "1340--1344"
}

@article{NSC70,
author = "D. J. Newman and G. E. Stedman and M. M. Curtis",
title =  "The use of simplified models in crystal field theory",
journal = "Colloques Internationaux, CNRS",
year = 1970,
volume = "{\bf 180}",
pages = "505--512",
}
@InCollection{Jud78,
  author =       "B. R. Judd",
  title =        "Ligand polarizations and lanthanide ion spectra",
  booktitle =    "Group theoretical methods in physics, Proceedings 1977",
  publisher =    "Springer",
  year =         1978,
  editor =       "P. Kramer and A. Rieckers",
  volume = "79",
  pages =        "417-419",
  address =      "Berlin"
}

@article{BN70,
author = "S. S. Bishton and D. J. Newman",
journal = JPC1,
title = "Parametrization of the correlation crystal field",
year = 1970,
volume = "{\bf 3}",
pages = "1753--1761"
}

@article{New70,
author = "D. J. Newman",
journal = JPCS,
title = "Many-body perturbation theory for non-orthogonal basis states",
year = 1970,
volume = "{\bf 31}",
pages = "1143--1149"
}

@article{New70a,
author = "D. J. Newman",
journal = CPL,
title = "Origin of the ground state splitting of {Gd$^{3+}$} in crystals",
year = 1970,
volume = "{\bf 6}",
pages = "288--290"
}

@article{CN71,
author = "M. M. Curtis and D. J. Newman",
journal = CPL,
title = "Power laws for lanthanide crystal field parameters",
year = 1971,
volume = "{\bf 9}",
pages = "606--608"
}

@article{New71a,
author = "D. J. Newman",
journal = JPC1,
title = "Spectroscopic data and parameters",
year = 1971,
volume = "{\bf 4}",
pages = "L185--L187"
}

@article{SN71,
author = "G. E. Stedman and D. J. Newman",
journal = JPCS,
title = "Crystal field in rare-earth fluorides.
         {II. P}arameters for {Er$^{3+}$} and {Nd$^{3+}$} in {LaF$_3$}",
year = 1971,
volume = "{\bf 32}",
pages = "109--114"
}

@article{SN71a,
author = "G. E. Stedman and D. J. Newman",
journal = JPCS,
title = "Crystal field in rare-earth fluorides.
       {III. A}nalysis of experimental data for the alkaline earth fluorides",
year = 1971,
volume = "{\bf 32}",
pages = "2001--2006"
}

@article{SN71b,
author = "G. E. Stedman and D. J. Newman",
journal = JCP,
title = "Spin--lattice relaxation and elastic properties of
        rare-earth substituted {LaCl$_3$}",
year = 1971,
volume = "{\bf 53}",
pages = "152--162"
}

@article{NS71,
author = "D. J. Newman and G. E. Stedman",
journal = JPCS,
title = "Analysis of the crystal field in rare-earth
         substituted oxysulphide and vanadate systems",
year = 1971,
volume = "{\bf 32}",
pages = "535--542"
}

@article{CNT71,
author = "G. M. Copland and D. J. Newman and C. D. Taylor",
journal = JPB,
title = "Configuration interaction in rare earth ions: {II}. {M}agnetic interactions",
year = 1971,
volume = "{\bf 4}",
pages = "1388--1392"
}

@article{NBCT71,
author = "D. J. Newman and S. S. Bishton and M. M. Curtis and C. D. Taylor",
journal = JPC1,
title = "Configuration interaction and lanthanide crystal fields",
year = 1971,
volume = "{\bf 4}",
pages = "3234--3248"
}

@article{SBP68,
author = "R. M. Sternheimer and  M. Blume and R. F. Peierls",
journal = PR,
title = "Shielding of crystal field at rare-earth ions",
year = 1968,
volume = "{\bf 173}",
pages = "376--389"
}

@article{NU72,
author = "D. J. Newman and W. Urban",
journal = JPC1,
title = "A new interpretation of the {Gd$^{3+}$} ground
         state splitting",
year = 1972,
volume = "{\bf 5}",
pages = "3101--3109"
}

@article{USH74,
author = "W. Urban and E. Siegel and W. Hillmer",
journal = pssb,
title = "Trigonal centre of {Gd$^{3+}$} in {CdS} investigated by
         variable frequency {EPR}",
year = 1974,
volume = "{\bf 62}",
pages = "73--81"
}

@article{CNT73,
author = "R. Chatterjee and D. J. Newman and C. D. Taylor",
journal = JPC1,
title = "The relativistic crystal field",
year = 1973,
volume = "{\bf 6}",
pages = "706--714"
}

@article{New73,
author = "D. J. Newman",
journal = JPCS,
title = "Slater parameter shifts in substituted lanthanide ions",
year = 1973,
volume = "{\bf 34}",
pages = "541--545"
}

@article{New73b,
author = "D. J. Newman",
journal = JPC1,
title = "Crystal field and exchange parameters in {KNiF$_3$}",
year = 1973,
volume = "{\bf 6}",
pages = "2203--2208"
}

@article{LN73,
author = "B. F. Lau and D. J. Newman",
journal = JPC1,
title = "Crystal field and exchange parameters in {NiO} and {MnO}",
year = 1973,
volume = "{\bf 6}",
pages = "3245--3254"
}
 
@article{New73c,
author = "D. J. Newman",
journal = JPC1,
title = "Band structure and the crystal field",
year = 1973,
volume = "{\bf 6}",
pages = "458--466"
}

@article{HF96,
author = "K. Hummler and M. F{\" a}hnle",
journal = PRB,
title = "Full-potential linear-muffin-tin-orbital calculations of the magnetic
          properties of rare-earth-transition-metal intermetallics. 
         {I}. {D}escription of the formalism and application to the series
         {RCo$_5$} ({R $=$} rare-earth atom)",
year = 1996,
volume = "{\bf 53}",
pages = "3272--3289"
}

@article{HF96a,
author = "K. Hummler and M. F{\" a}hnle",
journal = PRB,
title = "Full-potential linear-muffin-tin-orbital calculations of the magnetic
          properties of rare-earth-transition-metal intermetallics. 
         {II}. {Nd$_2$Fe$_{14}$B}",
year = 1996,
volume = "{\bf 53}",
pages = "3272--3289"
}

@article{MN73,
author = "B. Morosin and D. J. Newman",
journal = "Acta Cryst.",
title = "{La$_2$O$_2$S} structure refinement and crystal field",
year = 1973,
volume = "{\bf B29}",
pages = "2647--2648"
}

@article{New74,
author = "D. J. Newman",
journal = JPCS,
title = "Quasi-localized representation of electronic band
structures in cubic crystals",
year = 1974,
volume = "{\bf 35}",
pages = "1187--1199"
}

@article{New74a,
author = "D. J. Newman",
journal = JPC1,
title = "On the {M}adelung potential contribution to {S}later
         parameter shifts",
year = 1974,
volume = "{\bf 7}",
pages = "L227--L229"
}

@article{SN74,
author = "G. E. Stedman and D. J. Newman",
journal = JPC1,
title = "Analysis of the spin-lattice parameters for {G}d$^{3+}$
          an {E}u$^{2+}$ in cubic crystals",
year = 1974,
volume = "{\bf 7}",
pages = "2347--2352"
}

@article{BN75,
author = "G. Balasubramanian and D. J. Newman",
journal = JPCS,
title = "Crystal field splitting of 5$d$ states in {Ce$_{3+}$:YPO$_4$}",
year = 1975,
volume = "{\bf 36}",
pages = "57--60"
}

@article{NB75,
author = "D. J. Newman and G. Balasubramanian",
journal = JPC1,
title = "Parametrization of rare-earth ion transition intensities",
year = 1975,
volume = "{\bf 8}",
pages = "37--44",
note = "In this paper the sense of $\sigma$
and $\pi$ polarization is reversed from the convention used in Chapter 10"}

@article{New75,
author = "D. J. Newman",
journal = JPC1,
title = "Interpretation of {Gd$^{3+}$} spin-{H}amiltonian parameters",
year = 1975,
volume = "{\bf 8}",
pages = "1862--1868"}

@article{NP75,
author = "D. J. Newman and D. C. Price",
journal = JPC1,
title = "Determination of the electrostatic contributions 
          to lanthanide quadrupolar crystal fields",
year = 1975,
volume = "{\bf 8}",
pages = "2985--2991"}

@article{EN75,
author = "A. Edgar and D. J. Newman",
journal = JPC1,
title = "Local distortion effects on the spin-{H}amiltonian 
         parameters of {G}d$^{3+}$ substituted into the fluorites",
year = 1975,
volume = "{\bf 8}",
pages = "4023--4030"}

@article{Edg76,
author = "A. Edgar",
journal = JPC1,
title = "Electron paramagnetic resonance studies of divalent cobalt ions
          in some chloride salts",
year = 1976,
volume = "{\bf 9}",
pages = "4303--4314"}

@article{New75b,
author = "D. J. Newman",
journal = JPC1,
title = "Ligand polarizability and the {G}d$^{3+}$ spin-{H}amiltonian",
year = 1975,
volume = "{\bf 8}",
pages = "L520--L522"}

@article{NE76,
author = "D. J. Newman and A. Edgar",
journal = JPC1,
title = "Interpretation of {G}d$^{3+}$ spin-{H}amiltonian parameters
         in garnet host crystals",
year = 1976,
volume = "{\bf 9}",
pages = "103--109"}

@article{New76,
author = "D. J. Newman",
journal = SSC,
title = "The ground state splitting in {G}d$^{3+}$ and {E}u$^{2+}$",
year = 1976,
volume = "{\bf 18}",
pages = "667--668"}

@article{New76a,
author = "D. J. Newman",
journal = AJP,
title = "Crystal field effects in {S}-state ions due to exchange polarization",
year = 1976,
volume = "{\bf 29}",
pages = "177--182"}

@article{New76b,
author = "D. J. Newman",
journal = AJP,
title = "Analysis of {E}u$^{2+}$ spin-Hamiltonian parameters",
year = 1976,
volume = "{\bf 29}",
pages = "263--272"
}

@article{NS76,
author = "D. J. Newman and E. Siegel",
journal = JPC1,
title = "Superposition model analysis of {F}e$^{3+}$ and {M}n$^{2+}$
        spin-{H}amiltonian parameters",
year = 1976,
volume = "{\bf 9}",
pages = "4285--4292"
}

@article{SM79a,
author = "E. Siegel and K. A. M{\"u}ller",
journal = PRB,
title = "Structure of transition-metal-oxygen-vacancy pair centres",
year = 1979,
volume = "{\bf 19}",
pages = "109--120"
}

@article{SDO66,
author = "R. R. Sharma and T. P. Das and R. Orbach",
journal = PR,
title = "Zero field splitting in {S}-state ions {I. P}oint multipole model",
year = 1966,
volume = "{\bf 149}",
pages = "257--269"
}

@article{SDO67,
author = "R. R. Sharma and T. P. Das and R. Orbach",
journal = PR,
title = "Zero field splitting in {S}-state ions 
        {II. O}verlap and covalency model",
year = 1967,
volume = "{\bf 155}",
pages = "338--352"
}

@article{SDO68,
author = "R. R. Sharma and T. P. Das and R. Orbach",
journal = PR,
title = "Zero field splitting in {S}-state ions {III. C}orrections
         to {P}arts {I and II} and application to distorted cubic crystals",
year = 1968,
volume = "{\bf 171}",
pages = "378--388"
}

@article{SM79b,
author = "E. Siegel and K. A. M{\"u}ller",
journal = PRB,
title = "Local position of {Fe}$^{3+}$ in ferroelectric {BaTiO}$_3$",
year = 1979,
volume = "{\bf 20}",
pages = "3587--3595"
}

@article{MB83,
author = "K. A. M{\"{u}}ller and W. Berlinger",
journal = JPC1,
title = "Superposition model for 6-fold-coordinated {Cr$^{3+}$} in
          oxide crystals",
year = 1983,
volume = "{\bf 16}",
pages = "6861--6874"
}

@article{MBA85,
author = "K. A. M{\"{u}}ller and W. Berlinger and J. Albers",
journal = PRB,
title = "Paramagnetic resonacne and local position of {Cr$^{3+}$}
          in ferroelectric {BaTiO$_3$}",
year = 1985,
volume = "{\bf 32}",
pages = "5837--5844"
}

@article{DEC93,
author = "H. Donnerberg and M. Exner and C. R. A. Catlow",
title =  "Local geometry of {Fe$^{3+}$} ions on the potassium sites in {KTaO$_3$}",
journal = PRB,
volume = "{\bf 47}", 
pages  = "14--19",
year   = 1993
}

@article{Don94,
author = "H. Donnerberg",
journal = PRB,
title = "Geometrical microstructure of {Fe$^{3+}_{\rm Nb}-V_0$} defects in {KNbO$_3$}", 
volume = "{\bf 50}", 
pages  = "9053--9062",
year   = 1994
}

@article{NV76,
author = "P. Nov\'ak and I. Veltrusk\'y",
journal = pssb,
title = "Overlap and covalency contributions to the zero field splitting of 
         {S}-state ions",
year = 1976,
volume = "{\bf 73}",
pages = "575--586"
}


@article{New77,
author = "D. J. Newman",
journal = "Physica B",
title = "Interpretation of the fourth--order spin--Hamiltonian parameters
         for Europium and Gadolinium ground states",
year = 1977,
volume = "{\bf 86--88}",
pages = "1231--1232"
}

@article{New77a,
author = "D. J. Newman",
journal = JPC1,
title = "On the g-shift of {S}-state ions",
year = 1977,
volume = "{\bf 29}",
pages = "L315--L318"
}

@article{New77b,
author = "D. J. Newman",
journal = AJP,
title = "Ligand ordering parameters",
year = 1977,
volume = "{\bf 30}",
pages = "315--323"}

@article{New77c,
author = "D. J. Newman",
journal = JPC1,
title = "Parametrization of crystal induced correlation
         between $f$--electrons",
year = 1977,
volume = "{\bf 10}",
pages = "4753--4764"}

@article{New77d,
author = "D. J. Newman",
journal = JPC1,
title = "Calculation of the effect of spin--correlation 
         on lanthanide crystal fields",
year = 1977,
volume = "{\bf 10}",
pages = "L617--L620"}

@article{NPR78,
author = "D. J. Newman and D. C. Price and W. A. Runciman",
journal = "Amer. Mineral.",
title = "Superposition model analysis of the near infrared 
         spectrum of {F}e$^{3+}$ in pyrope-almandine garnets",
year = 1978,
volume = "{\bf 63}",
pages = "1278--1288"}

@article{New78a,
author = "D. J. Newman",
journal = AJP,
title = "The orbit-lattice interaction for lanthanide ions. 
         {I}. Determination of empirical parameters",
year = 1978,
volume = "{\bf 31}",
pages = "79--93"}

@article{AN78,
author = "S. Ahmad and D. J. Newman",
title = "Finite ligand size and {S}ternheimer antiscreening in 
         lanthanide ions",
journal = AJP,
volume = "{\bf 31}", 
pages  = "421--426",
year   = 1978
}

@article{AN79,
author = "S. Ahmad and D. J. Newman",
title = "The use of discrete basis sets in configuration
         interaction calculations",
journal = "Comput. Phys. Commun.",
volume = "{\bf 18}", 
pages  = "331--337",
year   = 1979
}


@article{New80,
author = "D. J. Newman",
journal = AJP,
title = "The orbit-lattice interaction for lanthanide ions. 
         {II}. Strain and relaxation time predictions for cubic systems",
year = 1980,
volume = "{\bf 33}",
pages = "733--743"
}

@article{CN81,
author = "S. C. Chen and D. J. Newman",
journal = "Physica B",
title = "Dynamic crystal field contributions of next-nearest 
        neighbour ions in octahedral symmetry",
year = 1981,
volume = "{\bf 107}",
pages = "365--366"
}

@article{AN80,
author = "S. Ahmad and D. J. Newman",
title = "Finite ligand size and the {S}ternheimer anti-shielding factor
         $\gamma_{\infty}$",
journal = AJP,
volume = "{\bf 33}", 
pages  = "303--306",
year   = 1980
}

@article{PN81,
author = "Y. M. Poon and D. J. Newman",
journal = JCP,
title = "Comment on the energy level analysis of Np$^{3+}$:LaCl$_3$
         and Np$^{3+}$:LaBr$_3$",
year = 1981,
volume = "{\bf 75}",
pages = "3646--3647"
}	

@article{NA81,
author = "D. J. Newman and S. Ahmad",
journal = PL,
title = "Coulomb exchange contributions to lanthanide crystal fields",
year = 1981,
volume = "{\bf 85A}",
pages = "51--52"
}	

@article{NC82,
author = "D. J. Newman and S. C. Chen",
journal = PRB,
title = "Models of the dynamic crystal field",
year = 1982,
volume = "{\bf 25}",
pages = "41--46"
}	

@article{NC82a,
author = "D. J. Newman and K. S. Chan",
journal = JPC1,
title = "On the description of internal strain",
year = 1982,
volume = "{\bf 15}",
pages = "L323--L325" }	

@article{NSF82,
author = "D. J. Newman and G. G. Siu and W. Y. P. Fung",
journal = JPC1,
title = "Effect of spin-polarization on the crystal field of lanthanide ions",
year = 1982,
volume = "{\bf 15}",
pages = "3113--3125" }	

@article{CN82,
author = "S. C. Chen and D. J. Newman",
journal = AJP,
title = "The orbit--lattice interaction in lanthanide ions {III}: 
         superposition model analysis for arbitrary symmetry",
year = 1982,
volume = "{\bf 35}",
pages = "133--145"
}

@article{CN82a,
author = "S. C. Chen and D. J. Newman",
journal = JPA,
title = "Symmetry coordinates for {O$_h$} atomic shells",
year = 1982,
volume = "{\bf 15}",
pages = "331--341"
}

@article{PN82,
author = "Y. M. Poon and D. J. Newman",
journal = JCP,
title = "Parametrization of the {CsNpF$_6$} optical spectrum",
year = 1982,
volume = "{\bf 77}",
pages = "1078--1079"
}	

@article{SN82,
author = "G. G. Siu and D. J. Newman",
journal = JPC1,
title = "Contributions to the ground state splitting of S-state ions {I}: 
         The {${}^8$S$_{7/2}$} state of {G}d$^{3+}$",
year = 1982,
volume = "{\bf 15}",
pages = "6753--6764"
}	

@article{Siu90,
author = "G. G. Siu",
journal = JCP,
title = "Quadratic crystal field contributions to the ground $S$-state
         splitting of {G}d$^{3+}$",
year = 1990,
volume = "{\bf 92}",
pages = "97--103"}

@article{New81,
author = "D. J. Newman",
journal = JPA,
title = "Matrix mutual orthogonality and parameter independence",
year = 1981,
volume = "{\bf 14}",
pages = "L429--L431"
}	

@article{Lea87,
author = "R. C. Leavitt",
journal = JPA,
title = "A complete set of $f$-electron scalar operators",
year = 1987,
volume = "{\bf 20}",
pages = "3171--3183"
}

@article{JHR82,
author = "B. R. Judd and J. E. Hansen and A. J. J. Raassen",
journal = JPB,
title = "Parametric fits in the atomic d shell",
year = 1982,
volume = "{\bf 15}",
pages = "1457--1472"
}

@article{DHJL85,
author = "H. Dothe and J. E. Hansen and B. R. Judd and G. M. S. Lister",
journal = JPB,
title = "Orthogonal scalar operators for $p^Nd$ and $pd^N$",
year = 1985,
volume = "{\bf 18}",
pages = "1061--1080"
}

@article{HJL87,
author = "J. E. Hansen and B. R. Judd and G. M. S. Lister",
journal = JPB,
title = "Parametric fitting to 2$p^N3d$ configurations using
          orthogonal operators",
year = 1987,
volume = "{\bf 20}",
pages = "5291--5324"
}

@article{New82,
author = "D. J. Newman",
journal = JPC1,
title = "Superposition model analysis of spin-Hamiltonian parameters",
year = 1982,
volume = "{\bf 15}",
pages = "6627--6630"
}	

@article{New82a,
author = "D. J. Newman",
journal = PL,
title = "Operator orthogonality and parameter uncertainty",
year = 1982,
volume = "{\bf 92A}",
pages = "167--169"
}	

@article{New83a,
author = "D. J. Newman",
journal = PL,
title = "Unique labelling of {$J$}-states in octahedral symmetry",
year = 1983,
volume = "{\bf 97A}",
pages = "153--154"
}	

@article{SN83,
author = "G. G. Siu and D. J. Newman",
journal = JPC1,
title = "Spin-correlation effects in lanthanide ion spectroscopy",
year = 1983,
volume = "{\bf 16}",
pages = "5031--5038"
}	

@article{CN83a,
author = "S. C. Chen and D. J. Newman",
journal = JPC1,
title = "Spin-phonon Hamiltonians for 4f$^n$ ions in cubic sites",
year = 1983,
volume = "{\bf 16}",
pages = "1179--1188"
}	

@article{CN83,
author = "S. C. Chen and D. J. Newman",
journal = JPC1,
title = "Superposition model of the orbit--lattice interaction {I}: 
analysis of strain results for {Dy$^{3+}$:CaF$_2$}",
year = 1983,
volume = "{\bf 16}",
pages = "5031--5038"
}	

@article{NS83,
author = "D. J. Newman and G. G. Siu",
journal = JPC1,
title = "A property of the spin-correlated crystal field",
year = 1983,
volume = "{\bf 16}",
pages = "L157--L158"
}

@article{New83,
author = "D. J. Newman",
journal = JPF,
title = "Models of lanthanide crystal fields in metals",
year = 1983,
volume = "{\bf 13}",
pages = "1511--1518"
}	

@article{Div91,
author = "M. Divi{\v s}",
journal = PSSb,
title = "Crystal fields in some rare earth
        intermetallics analysed in terms of the superposition model",
year = 1991,
volume = "{\bf 164}",
pages = "227--234"
}	

@article{GMO92,
author = "E. A. Goremychkin and A. Yu. Muzychka and R. Osborn",
journal = "Physica B",
title = "Crystal field potential of {NdCu$_2$Si$_2$}:
         {A} comparison with {CeCu$_2$Si$_2$}",
year = 1992,
volume = "{\bf 179}",
pages = "184--190"
}

@article{GO93,
author = "E. A. Goremychkin and R. Osborn",
journal = PRB,
title = "Crystal-field excitations in {CeCu$_2$Si$_2$}",
year = 1993,
volume = "{\bf 47}",
pages = "14$\, $280--14$\, $290"
}

@article{GOM94,
author = "E. A. Goremychkin and R. Osborn and A. Yu. Muzychka",
journal = PRB,
title = "Crystal-field effects in {PrCu$_2$Si$_2$}: 
         an evaluation of evidence for heavy-fermion behavior",
year = 1994,
volume = "{\bf 50}",
pages = "13$\, $863--13$\, $866"
}	

@article{CN84,
author = "S. C. Chen and D. J. Newman",
journal = JPC1,
title = "Superposition model of the orbit--lattice interaction {II}: 
analysis of strain results for {Er$^{3+}$:MgO}",
year = 1984,
volume = "{\bf 17}",
pages = "3045--3048"
}
   
@article{CCN84,
author = "K. S. Chan and S. C. Chen and D. J. Newman",
journal = JPC1,
title = "Internal strain, orbit--lattice coupling and phase transitions
in zircon structure crystals",
year = 1984,
volume = "{\bf 17}",
pages = "3049--3058"}

@article{CN84a,
author = "S. C. Chen and D. J. Newman",
journal = PL,
title = "Orbit--lattice coupling parameters for the lanthanides in 
{CaF$_2$}",
year = 1984,
volume = "{\bf 102A}",
pages = "251--252"}

@article{PN84,
author = "Y. M. Poon and D. J. Newman",
journal = JPC1,
title = "Overlap and covalency contributions to 
         lanthanide ion spectral intensity parameters", 
year = 1984,
volume = "{\bf 17}",
pages = "4319--4325"}

@article{NN84,
author = "B. Ng and D. J. Newman",
journal = JPC1,
title = "Models of the correlation crystal field for 
         octahedral 3$d^n$ systems",
year = 1984,
volume = "{\bf 17}",
pages = "5585--5594"}

@article{NNP84,
author  = "D. J. Newman and B. Ng and Y. M. Poon",
journal = JPC1,
title="Parametrization and interpretation of paramagnetic ion spectra",
volume = "{\bf 17}", 
pages  = "5577--5584",
year   = 1984}

@article{CN84c,
author = "H. Crosswhite and D. J. Newman",
journal = JCP,
title = "Spin-correlated crystal field parameters for lanthanide ions
substituted into {LaCl$_3$}",
year = 1984,
volume = "{\bf 81}",
pages = "4959--4962"}						

@article{NN85,
author = "B. Ng and D. J. Newman",
journal = JCP,
title = "Many-body perturbation theory for effective Hamiltonians
using non--orthogonal basis sets",
year = 1985,
volume = "{\bf 83}",
pages = "1758--1768"}

@article{NN85a,
author = "B. Ng and D. J. Newman",
journal = "Lanthanide Actinide Res.",
title = "{UF$_6$} phenomenology",
year = 1985,
volume = "{\bf 1}",
pages = "33--40"}

@article{YN85,
author = "Y. Y. Yeung and D. J. Newman",
journal = JCP,
title = "Unique labelling of {$J$}-states in finite symmetry", 
year = 1985,
volume = "{\bf 83}",
pages = "4691--4696"}

@article{YN85b,
author = "Y. Y. Yeung and D. J. Newman",
journal = CPL,
title = "Angular overlap and superposition models of the 
          orbit--lattice interaction", 
year = 1985,
volume = "{\bf 122}",
pages = "415--417"}

@article{CN85,
author = "K. S. Chan and D. J. Newman",
journal = JPC1,
title = "Superposition model of the orbit--lattice interaction {III: 
Quadratic coupling for lanthanides in cubic sites}",
year = 1985,
volume = "{\bf 18}",
pages = "55--66"}

@article{New85a,
author = "D. J. Newman",
journal = "Lanthanide Actinide Res.",
title = "Lanthanide and actinide crystal field intrinsic parameter variations",
year = 1985,
volume = "{\bf 1}",
pages = "95--102"}

@article{NN85b,
author = "D. J. Newman and B. Ng",
journal = JPC1,
title = "Two--electron tensor operator expressions in crystal--field theory",
year = 1985,
volume = "{\bf 18}",
pages = "L803--L806"}

@article{YN85a,
author = "Y. Y. Yeung and D. J. Newman",
journal = JCP,
title = "Crystal field invariants and parameters for low symmetry sites", 
year = 1985,
volume = "{\bf 82}",
pages = "3747--3752"}

@article{NN86b,
author = "B. Ng and D. J. Newman",
journal = JPC1,
title = "{\it Ab-initio} calculation of crystal field correlation effects in 
{Pr$^{3+}$--Cl$^-$}",
year = 1986,
volume = "{\bf 19}",
pages = "L585--588"}

@article{NN86c,
author = "D. J. Newman and B. Ng",
journal = CPL,
title = "{\it Ab-initio} calculation of crystal field correlation effects in 
{Mn$^{2+}$--F$^-$}",
year = 1986,
volume = "{\bf 130}",
pages = "410--412"}

@article{NN86d,
author = "B. Ng and D. J. Newman",
journal = JCP,
title = "A linear model of crystal field correlation effects in 
{Mn$^{2+}$}",
year = 1986,
volume = "{\bf 84}",
pages = "3291--3296"}

@article{NN86f,
author = "B. Ng and D. J. Newman",
journal = PSSb,
title = "Tensorial coupling and the correlation crystal field",
year = 1986,
volume = "{\bf 134}",
pages = "K51--53"}

@article{SN86,
author = "G. G. Siu and D. J. Newman",
journal = "Lanthanide Actinide Res.",
title = "Spin--correlated intensities: a new parametrization",
year = 1986,
volume = "{\bf 1}",
pages = "163--168"}

@article{YN86a,
author = "Y. Y. Yeung and D. J. Newman",
journal = JCP,
title = "High order crystal field invariants and the 
        determination of lanthanide crystal field parameters", 
year = 1986,
volume = "{\bf 84}",
pages = "4470--4473"}

@article{NN86,
author = "D. J. Newman and B. Ng",
journal = JPC1,
title = "{\it Ab-initio} lanthanide crystal field 
         calculation for small internuclear separations",
year = 1986,
volume = "{\bf 19}",
pages = "389--394"}

@article{YN86b,
author = "Y. Y. Yeung and D. J. Newman",
journal = JPC1,
title = "A new approach to the determination of lanthanide 
   spin-correlated crystal field parameters", 
year = 1986,
volume = "{\bf 19}",
pages = "3877--3884"}

@article{YN86c,
author = "Y. Y. Yeung and D. J. Newman",
journal = PRB,
title = "Superposition model analyses for the {Cr${3+}$} {$^4{\rm A}_2$}
         ground state", 
year = 1986,
volume = "{\bf 34}",
pages = "2258--2265"}

@article{YN87,
author = "Y. Y. Yeung and D. J. Newman",
journal = JCP,
title = "Orbitally correlated crystal field parametrization
          for lanthanide ions", 
year = 1987,
volume = "{\bf 86}",
pages = "6717--6721"}

@article{NN87a,
author = "B. Ng and D. J. Newman",
journal = JCP,
title = "Many-body crystal field calculations 
{II}: {R}esults for the system {Pr$^{3+}$--Cl$^-$}",
year = 1987,
volume = "{\bf 87}",
pages = "7110--7117"}

@article{NN87b,
author = "B. Ng and D. J. Newman",
journal = JCP,
title = "Many-body crystal field calculations 
{I}: Methods of computation and perturbation expansion",
year = 1987,
volume = "{\bf 87}",
pages = "7096--7109"}

@article{NN87c,
author = "D. J. Newman and B. Ng",
journal ="Mol. Phys.",
title = "Intermediate symmetry, the superposition model and induced representations",
year = 1987,
volume = "{\bf 61}",
pages = "1443--1453"}

@article{YN88,
author = "Y. Y. Yeung and D. J. Newman",
journal = JPC1,
title = "Local distortion and spin--Hamiltonian parameters for 
         {Eu$^{2+}$} sites in the alkali halides", 
year = 1988,
volume = "{\bf 21}",
pages = "537--551"}

@article{NN88,
author = "B. Ng and D. J. Newman",
journal = JPC1,
title = "Spin-correlated crystal field parameters for trivalent actinides",
year = 1988,
volume = "{\bf 21}",
pages = "3273--3276"}

@article{NN89,
author = "D. J. Newman and B. Ng",
journal = "J.Phys.:Condens. Matter",
title = "Crystal field superposition model analyses for tetravalent actinides",
year = 1989,
volume = "{\bf 1}",
pages = "1613--1619"}

@InCollection{JNN89,
  author = 	 "B. R. Judd and D. J. Newman and B. Ng",
  title = 	 "Properties of orthogonal operators",
  booktitle =	 "Symmetries in science {III}",
  publisher =	 "Plenum Press",
   address = "New York",
  year =	 1989,
  editor =	 "B. Gruber and F. Iachello",
  pages =	 "215--224"}

@article{NN89a,
author = "D. J. Newman and B. Ng",
journal = "Rep. Prog. Phys.",
title = "The superposition model of crystal fields",
year = 1989,
volume = "{\bf 52}",
pages = "699--763"}

@article{Ste52,
author = "K. W. H. Stevens",
journal = PPS,
title = "Matrix elements and operator equivalents connected with the magnetic
         properties of rare-earth ions",
year = 1952,
volume = "{\bf A65}",
pages = "209--215"}

@Article{BR98a,
  author = 	 "G. W. Burdick and F. S. Richardson",
  title = 	 "Correlation-crystal-field delta-function analysis 
		  of 4$f^2$ ({Pr}$^{3+}$) energy-level structure",
  journal =	 JAC,
  year =	 1998,
  volume =	 "{\bf 275--277}",
  pages =	 "379--383"}

@Article{RMSB96,
  author =       "H. J. Ross and L. F. McAven and K. Shinagawa 
                 and P. H. Butler",
  title =        "Calculating spin-orbit matrix elements with {\sc racah}",
  journal =      "J. Comp. Phys.",
  year =         "1996",
  volume = "{\bf 128}",
  pages =        "331--340"}
 
@Article{WDMLH97,
  author = 	 {Wegh, R. T. and Donker,  H. and Meijerink, A. and
		  Lamminmaki, R. J. and H{\"{o}}lsa, J.},
  title = 	 {Vacuum-ultraviolet spectroscopy
                 and quantum cutting for {Gd$^{3+}$} in {LiYF$_4$}},
  journal = 	 {Phys. Rev. B},
  year = 	 {1997},
  volume =	 "{\bf 56}",
  pages =	 {13$\,$841--13$\,$848}}

@Unpublished{Bur99,
  author = 	 "G. W. Burdick",
  title = 	 "Correlation-crystal-field delta-function analysis 
		  of 4f$^3$ ({Nd}$^{3+}$) energy-level structure",
  note = 	 "Unpublished"
}

@Article{BCR99,
  author = 	 "G. W. Burdick and S. M. Crooks and M. F. Reid",
  title = 	 "Ambiguities in the parametrization of {$4f^N - 4f^N$}
                  electric-dipole transition intensities",
  journal =	 "Phys. Rev. B",
  year =	 "1999",
  volume =	 "{\bf 59}",
  pages =	 "7789--7793"
}

@article{BR98,
author = "A. R. Bryson and M. F. Reid",
title = "Transition amplitude calculations for one- and two-photon
          absorption",
journal = JAC,
year    = 1998,
volume = "{\bf 275--277}",
pages = "284--287"}

@article {BSR88,
author = {M. T. Berry and C. Schweiters and F. S. Richardson}, 
journal=     {Chem. Phys.},
title = {Optical absorption spectra, crystal-field analysis, 
          and electric dipole intensity parameters for 
          europium in 
          {Na$_3$[Eu(ODA)$_3$].2NaClO$_4$.6H$_2$O}},
volume= "{\bf 122}",
pages= {105--124},
year= {1988} }

@article {BeEd85,
author = {P. C. Becker and N. Edelstein and G. M. Williams
            and J. J. Bucher and
              R. E. Russo and
     J. A. Koningstein and L. A. Boatner and M. M. Abraham},
title = {Intensities and asymmetries of electronic {Raman} scattering in 
		  {ErPO$_4$} and {TmPO$_4$}},
journal= {Phys. Rev. B},
volume = "{\bf 31}",
pages=     {8102--8110},
year= {1985}}        

@Article{CFR68,
  author = 	 {W. T. Carnall and P. R. Fields and K. Rajnak},
  title = 	 {Electronic energy levels in the trivalent lanthanide
		  aquo ions. {I. Pr$^{3+}$,
		  Nd$^{3+}$, Pm$^{3+}$, Sm$^{3+}$,
		  Dy$^{3+}$, Ho$^{3+}$, Er$^{3+}$, and Tm$^{3+}$}},
  journal = 	 {J. Chem. Phys.},
  year = 	 {1968},
  volume =	 "{\bf 49}",
  pages =	 {4424--4442}
}

@article{CRTZ97,
author = "S. M. Crooks and M. F. Reid and P. A. Tanner and Y. Y. Zhao",
title = "Vibronic intensity parameters for {Er$^{3+}$} in {Cs$_2$NaErCl$_6$}",
journal = "J. Alloys Compd.",
year = 1997,
volume = "{\bf 250}",
pages = "297--301"
}

@TechReport{CCC77,
  author = 	 {W. T. Carnall and H. Crosswhite and H. M. Crosswhite},
  title = 	 {Energy level structure and transition probabilities in 
		  the spectra of the trivalent lanthanides in {LaF$_3$}},
  institution =  {Argonne National Laboratory},
  year = 	 1977
}

@TechReport{CGRR88,
  author = 	 {W. T. Carnall and G. L. Goodman and K. Rajnak and
		  R. S. Rana},
  title = 	 {A systematic analysis of the spectra of the
		  lanthanides doped into single crystal {LaF$_3$}},
  institution =  {Argonne National Laboratory},
  number      =  {ANL-88-8},		  
  year = 	 1988} 

@INCOLLECTION{Do89,
 author="M. C. Downer",
 title ="The puzzle of two-photon rare earth spectra in solids", 
 pages="29--75",
 booktitle="Laser spectroscopy of solids {II}",
 editor="W. M. Yen",
 publisher="Springer",
 address="Berlin",
 year=1989}
             
@incollection {GB98,
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title       = {Spectral intensities of $f-f$ transitions},
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publisher   = {North Holland},
address     = {Amsterdam},
volume      = "{\bf 25}",
year        = {1998},
editor      = {K. A. {Gschneidner Jr} and L. Eyring},
pages       = {101--264}}

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@Article{KuMaRo80,
  author = 	 {R. Kuroda and S. F. Mason and C. Rosini},
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		  complexes},
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@Article{MuNgGa97,
  author = 	 {K. M. Murdoch and A. D. Nguyen and J. C. G{\^{a}}con},
  title = 	 {Two-photon absorption spectroscopy of {Cm$^{3+}$} in
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  journal = 	 {Phys. Rev. B},
  volume = "{\bf 56}",
  year = 	 {1997},
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@ARTICLE{ReBu82a,
  title="The point-group crystal field and the 
         superposition model for
         {RE$^{3+}$} ions in {CaF$_{2}$} and {SrF$_{2}$}",
  journal="J. Phys. C", volume= "{\bf 15}", pages="4103--4116", year=1982,
  author="M. F. Reid and P. H. Butler"
}

@ARTICLE{RR83a,
  title="Anisotropic ligand polarizability contributions to 
         lanthanide 4$f$--4$f$ intensity parameters",
  journal="Chem. Phys. Lett.", volume = "{\bf 95}", pages="501--507", year=1983,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{ReRi83b,
  title="Rationalization of the $f$--$f$ intensity parameters for
        transitions between crystal-field levels of lanthanide ions",
  journal="J. Less Common Metals", volume = "{\bf 93}", pages="113--118",
  year=1983,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{ReRi83c,
  title="Electric dipole intensity parameters for
         lanthanide 4$f$--4$f$ transitions",
  journal="J. Chem. Phys.", volume = "{\bf 79}", pages="5735--5742", year=1983,
  author="M. F. Reid and F. S. Richardson"
}
@ARTICLE{ReDaRi83,
  title="Comparison of calculated and experimental 4$f$--4$f$
         intensity parameters for lanthanide complexes with 
         isotropic ligands",
  journal="J. Chem. Phys.", volume = "{\bf 79}", pages="5743--5751", year=1983,
  author="M. F. Reid and J. J. Dallara and F. S. Richardson"
}

@ARTICLE{RR84a,
  title="Parametrization of electric dipole intensities in the
         vibronic spectra of rare-earth complexes",
  journal="Mol. Phys.", volume = "{\bf 51}", pages="1077--1094", year=1984,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{RR84b,
  title="Comparison of calculated and experimental 4$f$--4$f$
         intensity parameters for europium
         tris(ethylsulphate) enneahydrate",
  journal="J. Chem. Phys.", volume = "{\bf 80}", pages="3507--3509", year=1984,
  author="M. F. Reid and F. S. Richardson"
}
@ARTICLE{RR84c,
  title="Lanthanide 4$f$--4$f$ electric dipole intensity theory",
  Journal="J. Phys. Chem.", volume = "{\bf 88}", pages="3579--3586", year=1984,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{DRR84,
  title="Anisotropic ligand polarizability contributions to
         intensity parameters for the trigonal
         {Eu(ODA)$^{3\hbox{-}}_{3}$} and
         {Eu(DBM)$_{3}$H$_{2}$O} systems",
  journal="J. Phys. Chem.", volume = "{\bf 88}", pages="3587--3594", year=1984,
  author="J. J. Dallara and M. F. Reid and F. S. Richardson"}

@ARTICLE{RR84d,
  title="Ligand polarization contributions to two-photon absorption
         in lanthanide ions",
  journal="Phys. Rev. B", volume = "{\bf 29}", pages="2830--2832", year=1984,
  author="M. F. Reid and F. S. Richardson"}

@ARTICLE{StDaReRi84,
  title="Empirical intensity parameters for the 4$f$--4$f$ absorption
         spectra of nine-coordinate {neodymium(III)} and {holmium(III)}
         complexes in aqueous solution",
  journal="Inorg. Chem.", volume="{\bf 23}", pages="4607--4611", year=1984,
  author="E. M. Stephens and S. Davis and M. F. Reid
          and F. S. Richardson"}

@ARTICLE{StReRi84,
  title="Model calculations for the intensity parameters of
         nine-coordinate neodymium {(III)} and holmium {(III)} complexes
         in aqueous solution",
  journal="Inorg. Chem.", volume="{\bf 23}", pages="4611--4618", year=1984,
  author="E. M. Stephens and M. F. Reid and F. S. Richardson"
}

@ARTICLE{RR84e,
  title="Electric dipole intensity parameters for {Pr$^{3+}$} in
         {LiYF$_{4}$}",
  journal="J. Luminescence", volume = "{\bf 31/32}", pages="207--209",
  year=1984,
  author="M. F. Reid and F. S. Richardson"
}

@INPROCEEDINGS{RR85a,
  title="What do $f$--$f$ electric dipole intensity parameters tell us
         about mechanism?",
  booktitle="Rare Earths Spectroscopy",
  editor="B. Je\.{z}owska-Trzebiatowska and J. Legenziewicz and W. Strek",
  pages="298--308", publisher="World Scientific", 
  address ="Singapore", 
  year=1985,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{FRR85,
  title="Optical emission spectra and crystal-field analysis of
         {Tm$^{3+}$} in the cubic {Cs$_{2}$NaYCl$_{6}$} host",
  journal="J. Chem. Phys.", volume="{\bf 83}", pages="3225--3233", year=1985,
  author="D. R. Foster and M. F. Reid and F. S. Richardson"
}

@ARTICLE{RRDS85,
  title="Energy levels of lanthanide ions in the cubic
         {Cs$_{2}$NaLnCl$_{6}$} and {Cs$_{2}$NaYCl$_{6}$:Ln$^{3+}$}
          (doped) systems",
  journal="J. Chem. Phys.", volume = "{\bf 83}", pages="3813--3830", year=1985,
  author="F. S. Richardson and M. F. Reid and J. J. Dallara and
          R. D. Smith"
}

@ARTICLE{RR85b,
  title="Free--ion, crystal--field, and spin--correlated crystal--field
         parameters for lanthanide ions in the cubic {Cs$_{2}$NaLnCl$_{6}$}
         and {Cs$_{2}$NaYCl$_{6}$:Ln$^{3+}$} (doped) systems",
  journal="J. Chem. Phys.", volume="{\bf 83}", pages="3831--3836", year=1985,
  author="M. F. Reid and F. S. Richardson"
}

@ARTICLE{BRR86,
 title="The ligand dependence of lanthanide 4$f$--4$f$ magnetic dipole
        transition moments",
 journal="J. Chem. Phys.", volume="{\bf 84}", pages="2917--2925", year=1986,
 author="M. T. Berry and M. F. Reid and F. S. Richardson"
}

@ARTICLE{RiBeRe86,
  title="Ligand polarization contributions to lanthanide 4$f$--4$f$
  magnetic dipole transition moments and rotatory strengths",
  journal="Mol. Phys.", volume= "{\bf 58}", pages="929--945", year=1986,
  author="F. S. Richardson and M. T. Berry and M. F. Reid"
}

@ARTICLE{DSRR87,
  title="Model calculations for the intensity parameters of
         nine-coordinate erbium{(III)} complexes of trigonal symmetry",
  journal="Inorg. Chem.", volume="{\bf 26}", pages="1204--1207", year=1987,
  author="M. T. Devlin and E. M. Stephens and M. F. Reid and
          F. S. Richardson"}

@ARTICLE{RRT87,
  title="Comparison of 4$f^{2}$ energy parameters for {Pr$^{3+}$} in cubic
         elpasolite crystals",
  journal="Mol. Phys.", volume = "{\bf 60}", pages="881--886", year=1987,
  author="M. F. Reid and F. S. Richardson and P. A. Tanner"}

@ARTICLE{TDRR87,
  title="Energy levels of {Er$^{3+}$} in {Cs$_{2}$NaYCl$_{6}$}",
  journal="Mol. Phys", volume = "{\bf 60}", pages="1037--1045", year=1987,
  author="P. A. Tanner and A. DePiante and F. S. Richardson and
          M. F. Reid"}

@ARTICLE{JRTR87,
  title="Analysis and comparison of holmium 4$f^{10}$ energy levels in
          {Cs$_{2}$NaHoCl$_{6}$} and {Cs$_{2}$NaHoBr$_{6}$}",
  journal="Mol. Phys.", volume = "{\bf 61}", pages="635--644", year=1987,
  author="C. K. Jayasankar and F. S. Richardson and P. A. Tanner and
          M. F.Reid"
}

@ARTICLE{MRR87a,
  title="Optical spectra, energy levels, and crystal-field analysis of
         {Sm$^{3+}$} in {Na$_{3}$[Sm(oxydiacetate)$_{3}$] $\cdot$ 2NaClO$_{4}$
         $\cdot$ 6H$_{2}$O}",
  journal="Mol. Phys.", volume = "{\bf 61}", pages="1455--1470", year=1987,
  author="P. S. May and M. F. Reid and F. S. Richardson"
}

@ARTICLE{MRR87b, 
  title="Electric dipole intensity parameters for the samarium 
         4$f$--4$f$ transitions in {Na$_{3}$[Sm(oxydiacetate)$_{3}$]
         $\cdot$ 2NaClO$_{4}$ $\cdot$ 6H$_{2}$O}",  
  journal="Mol. Phys.", volume = "{\bf 61}", pages="1471--1485", year=1987, 
  author="P. S. May and M. F. Reid and F. S. Richardson"
}

@ARTICLE{MRR87c, 
  title="Circular dichroism and electronic rotatory strengths of the
         samarium 4$f$--4$f$  transitions in
         {Na$_{3}$[Sm(oxydiacetate)$_{3}$] $\cdot$ 2NaClO$_{4}$ $\cdot$ 
         6H$_{2}$O}", 
  journal="Mol. Phys.", volume = "{\bf 62}", pages="341--364", year=1987, 
  author="P. S. May and M. F. Reid and F. S. Richardson"
}

@ARTICLE{JRRPC87a,
  title="Spin--correlated crystal--field interactions in {NdF$_{3}$},
         {Nd$^{3+}$:LaF$_{3}$}, and {Nd$^{3+}$:LiYF$_{4}$}",
  journal="Inorg. Chim. Acta", volume= "{\bf 139}", pages="287--290",
  year=1987,
  author="C. K. Jayasankar and F. S. Richardson and M. F. Reid and
          P. Porcher and P. Caro"
}

@article{HF93,
author = "V. Hurtubise and K. F. Freed",
title = "The algebra of effective hamiltonians and operators: exact operators",
journal = "Adv. Chem. Phys.", volume = "{\bf 83}", pages = "465--541",
year = 1993}

@article{HF94,
author = "V. Hurtubise and K. F. Freed",
title = "Perturbative and complete model space linked diagrammatic expansions
  for the canonical effective operator",
journal = JCP, volume = "{\bf 100}", pages = "4955--4968", year = 1994}

@article{JJ64,
author = "C. K. J{\o}rgensen and B. R. Judd",
title = "Hypersensitive pseudo-quadrupole transitions in lanthanides",
journal = "Mol. Phys.", volume = "{\bf 8}", pages = "281--290", year = 1964}

@article{Jud79,
author = "B. R. Judd",
title = "Ionic transitions hypersensitive to environment",
journal = "J. Chem. Phys",
volume = "{\bf 70}", pages = "4830--4833",
year = 1979}

@article{MPS74,
author = "S. F. Mason and R. D. Peacock and B. Stewart",
title = "Dynamic coupling contributions to the intensity of hypersensitive
lanthanide transitions",
journal = "Chem. Phys. Lett.", volume = "{\bf 29}", pages = "149--153", year = 1974}

@article{Pea75,
author = "R. D. Peacock",
title = "The intensities of lanthanide $f$--$f$ transitions",
journal = "Struct. Bonding", volume = "{\bf 22}",pages = "83--122", year = 1975}

@article{SIB89,
author = "J. Sytsma and G. F. Imbusch and G. Blaase",
title = "The spectroscopy of {Gd$^{3+}$} in yttrium oxychloride: 
         {J}udd--{O}felt parameters from emission data",
journal = JCP, volume = "{\bf 91}", pages = "1456--1461", year = 1989}

@article{Ste85,
author = "G. E. Stedman",
title = "Polarization dependence of natural and field-induced one-photon
and multiphoton interactions",
journal = "Adv. Phys", volume = "{\bf 34}", pages = "513--587", year = 1985}

@ARTICLE{JaRiRePoCa87b,
  title="Reexamination of the 4$f^{3}$ energy parameters for several
         systems with neodymium--oxygen atom coordination",
  journal="Inorg. Chim. Acta", volume= "{bf 139}", pages="291--294",
           year=1987,
  author="C. K. Jayasankar and F. S. Richardson and M. F. Reid and
          P. Porcher and P. Caro"
}

@ARTICLE{Rei87a,
  title="Correlation crystal field analyses with orthogonal
         operators",
  journal="J. Chem. Phys.",  volume = "{\bf 87}", pages="2875--2884", year=1987,
  author="M. F. Reid"}

@ARTICLE{Rei87b,
  title="Superposition-model analysis of intensity parameters for
         {Eu$^{3+}$} luminescence",
  journal="J. Chem. Phys.",  volume = "{\bf 87}", pages="6388--6392", year=1987,
  author="M. F. Reid"}

@ARTICLE{RNN88,
  title="{\it Ab-initio} calculations of electric dipole intensity
        parameters for lanthanide $f$--$f$ transitions",
  journal="J.   Luminescence",    volume = "{\bf 40/41}",    pages="115--118",
  year=1988,
  author="M. F. Reid and B. Ng and D. J. Newman"}

@ARTICLE{Rei88, 
  title="On the use of {${\mbox{\bf E}\cdot \mbox{\bf r}}$} and 
         {$\mbox{\bf A}\cdot \mbox{\bf p}$} in 
         perturbation calculations of transition intensities for 
         paramagnetic ions in solids" ,
  journal="J. Phys. Chem. Solids", volume = "{\bf 49}", pages="185--189", 
  year=1988, 
  author="M. F. Reid"}

@ARTICLE{ReNgNe89, 
  title="{\it Ab-initio} calculation of intensity parameters for the 
         system {Pr$^{3+}$--Cl$^{-}$}",  
  journal="J.  Less  Common  Metals",  volume= "{\bf 148}",   pages="219--222", 
  year=1989, 
  author="M. F. Reid and B. Ng and D. J. Newman"}

@ARTICLE{YR89,
  title="Crystal-field and superposition-model analyses of
          {Pr$^{3+}$:LaF$_{3}$} in {C$_{2}$} symmetry",
  journal="J. Less Common Metals", volume= "{\bf 148}", pages="213--217",
  year=1989,
  author="Y. Y. Yeung and M. F. Reid"
}

@ARTICLE{CR89,
  title="Intensity parameters for {Eu$^{3+}$} luminescence --
         tests of the superposition model",
  journal="J. Less Common Metals", volume= "{\bf 148}", pages="207--212",
  year=1989,  author="D. K. T. Chan and M. F. Reid"
}

@ARTICLE{JaRiRe89,
  title="Phenomenological spin-correlated crystal-field analyses on
         energy levels in {Ln$^{3+}$:LaCl$_{3}$} systems",
  journal="J. Less Common Metals", volume= "{\bf 148}", pages="289--296",
  year=1989,
  author="C. K. Jayasankar and F. S. Richardson and
  M. F. Reid"
}

@ARTICLE{HaReRi89,
  title="Comparison of crystal-field parameters for
         {Ln(C$_{2}$H$_{5}$SO$_{4})_{3}$ $\cdot$ 9H$_{2}$O} and
         {Na$_{3}$[Ln(C$_{4}$H$_{4}$O$_{5}$)$_{3}$] $\cdot$ 6H$_{2}$O}
         systems",
  journal="J. Less Common Metals", volume= "{\bf 148}", pages="311--319",
  year=1989,
  author="R. M. Hammond and M. F. Reid and F. S. Richardson"
}

@ARTICLE{RN89,
  title="Complete second-order calculations of intensity parameters
        for one-photon and two-photon transitions of rare-earth ions in
        solids",
  journal="Mol. Phys.",  volume = "{\bf 67}", pages="407--415", year=1989,
  author="M. F. Reid and B. Ng"
}

@ARTICLE{JaReRi89,
  title="Comparative crystal-field analyses of {4$f^{N}$} energy levels in
         {LiYF$_{4}$:Ln$^{3+}$} systems",
  journal="Phys. Stat. Sol. (b)", volume= "{\bf 155}", pages="559", year=1989,
  author="C. K. Jayasankar and M. F. Reid and
          F. S. Richardson"
}

@ARTICLE{Re90,
  title="Time resolved circularly polarized luminescence as a probe
      of energy-transfer dynamics in rare-earth doped crystals",
  journal="J. Luminescence",  volume = "{\bf 45}", pages="384--386", year=1990,
  author="M. F. Reid"}

@ARTICLE{LR90,
  title="Correlation crystal field analysis of the {$^{2}$H(2)$_{11/2}$}
         multiplet of {Nd$^{3+}$}",
  journal="Phys. Rev. B", volume = "{\bf 42}", pages="1903--1909", year=1990,
  author="C. L. Li and M. F. Reid"
}

@ARTICLE{ReLi91,
  title="Correlation crystal field analysis of {Np$^{3+}$:LaCl$_{3}$}",
  journal="Eur. J. Solid State Inorg. Chem.", volume = "{\bf t.28}",
  pages="171--174", year=1991,
  author="M. F. Reid and C. L. Li"
}

@PROCEEDINGS{GoDOGrMeReSi91,
  title="New Developments in {$f$}--Elements",
  year=1991,
  editor="C. {G\"{o}rller}-Walrand and W. D'Olieslager and J. E. Greedan and
          G. Meyer and M. F. Reid and H. Silber",
  address= "European Journal of Solid--State and Inorganic Chemistry,
                Supplement to volume 28"
}

@ARTICLE{Re92a,
  title="Recent extensions to crystal--field and transition--intensity
         models",
  journal="J. Alloys Compd.", 
  volume= "{\bf 180}", pages="93--103", year=1992,
  author="M. F. Reid"}

@ARTICLE{QuRiRe92,
  title="Comparative analysis of {Nd$^{3+}$} {(4$f^3$)} energy-level
         structures in various crystalline hosts",
  journal="J. Alloys Compd.", year="1992",
  volume = "{\bf 180}", pages="131", 
  author="J. R. Quagliano and F. S. Richardson and M. F. Reid"
}

@PROCEEDINGS{MoReSiTh92,
  title="Proceedings of the Nineteenth Rare Earth Research Conference",
  address="J. Alloys Compd., Volumes 180 and 181",
 year=1992,
 editor="L. R. Morss and M. F. Reid and H. B. Silber and
         J. D. Thompson"
}

@ARTICLE{TsRe92, 
  title="Unitary and {H}ermitian phase operators for the electromagnetic
         field", 
  journal="Phys. Rev. A", 
  volume = "{\bf 46}", pages="549--554", year=1992,   
  author="Y. K. Tsui and M. F. Reid"
}

@ARTICLE{Re93, 
  title="Additional operators for crystal-field and transition-intensity
         models", 
  journal="J. Alloys Compd.", year="1993",
  volume= "{\bf 193}", pages="160-164", 
  author="M. F. Reid"}

@ARTICLE{KoRe93, 
  title="Two-body operators for the f shell", 
  journal="J. Alloys Compd.", year="1993",
  volume= "{\bf 193}", pages="197-202", 
  author="H. J. Kooy and M. F. Reid"
}
 
@ARTICLE{LR93, 
  title="Group-theoretical analysis of correlation crystal-field models", 
  journal="J. Alloys Compd.", year="1993",
  volume= "{\bf 193}", pages="180-182", 
  author="T. S. Lo and M. F. Reid"
}

@article      {KuJaRe93,
author      = "V. V. R. K. Kumar and C. K. Jayasankar and M. F. Reid",
year        = 1993,
title       = "Optical properties of {Pr$^{3+}$} in alkali zinc
               borosulphate glasses",
journal     = "J. Alloys Compd.",
volume      = "{\bf 193}",
pages       = "189--191"
}

@article      {JaDeRuRe93,
author      = "C. K. Jayasankar and A. R. Devi and E. Rukmini and M. F. Reid",
year        = 1993,
title       = "Comparative analysis of free--ion energy levels of
               {Er$^{3+}$} ($4f^{11}$) in various crystal hosts",
journal     = "J. Alloys Compd.",
volume      = "{\bf 193}",
pages       = "203--206"
}

@ARTICLE{XR93,
  author=   "S. D. Xia and M. F. Reid",
  title=    "Comment: theoretical intensities of {$4f-4f$}
             transitions between {S}tark levels of
             the {Eu$^{3+}$} ion in crystals",
  journal=  "J. Phys. Chem. Sol.",
  volume=   "{\bf 54}",
  pages=    "777--778", 
  year=     1993
}
    
@ARTICLE{BuRe93a,
  author=   "G. W. Burdick and M. F. Reid",
  title=    "Many-body perturbation theory calculations of 
             two-photon absorption in lanthanide compounds", 
  journal=  "Phys. Rev. Lett.",
  volume = "{\bf 70}",
  pages=    "2491--2494", 
  year=     1993
}

@article      {BuKoRe93,
author      = "G. W. Burdick and H. J. Kooy and M. F. Reid",
year        = 1993,
title       = "Correlation contributions to two-photon lanthanide
        absorption intensities: direct calculations for {Eu$^{2+}$} ions",
journal     = "J. Phys.: Condens. Matter",
volume      = "{\bf 5}",
pages       = "L323-L328"
}

@ARTICLE{BuRe93b,
  author=   "G. W. Burdick and M. F. Reid",
  title=    "Reply to Comments on: {M}any-body perturbation theory
    calculations of two--photon absorption in lanthanide compounds", 
  journal=  "Phys. Rev. Lett.",
  volume = "{\bf 71}",
  pages=    "3892", 
  year=     1993
}

@article      {TaChRe93,
author      = "P. A. Tanner and M. Chua and M. F. Reid",
year        = 1993,
title       = "Energy transfer by magnetic dipole -- magnetic dipole
                interaction",
journal     = "Chem. Phys. Lett.",
volume      = "{\bf 209}",
pages       = "539--546"
}

@article      {JRTH93,
author      = "C. K. Jayasankar and M. F. Reid and
               {Th.} Tr{\"{o}}ster and W. B. Holzapfel",
year        = 1993,
title       = "Analysis of correlation effects in the crystal-field splitting
               of {Nd$^{3+}$:LaCl$_3$} under pressure",
journal     = "Phys. Rev. B",
volume      = "{\bf 48}",
pages       = "5919--5921",
}

@article      {GrQuReRi93,
author      = "J. B. Gruber and J. R. Quagliano and M. F. Reid 
           and F. S.  Richardson and M. E. Hills and M. D. Seltzer 
          and S. B. Stevens and C. A. Morrison and T. H. Allik",
year        = 1993,
title       = "Energy levels and correlation crystal-field effects in
              {Er$^{3+}$}-doped garnets",
journal     = "Phys. Rev. B",
volume      = "{\bf 48}",
pages       = "15561--15573",
}

@article      {DeJaRe94a,
author      = "A. R. Devi and C. K. Jayasankar and M. F. Reid",
year        = 1994,
title       = "Comparative correlation crystal field analysis of
               {Er$^{3+}$} {4f$^{11}$} in garnet hosts",
journal     = "J. Alloys Compd.",
volume      = "{\bf 207/208}",
pages       = "74--77",
}

@article      {ReBuKo94,
author      = "M. F. Reid and G. W. Burdick and H. J. Kooy",
year        = 1994,
title       = "The relationship between perturbation theory and direct
     calculations of rare earth transition intensities",
journal     = JAC,
volume      = "{\bf 207/208}",
pages       = "78--82",
}

@Article{TaKuJaRe94,
  author = 	 "P. A. Tanner and V. V. R. K. Kumar and
  C. K. Jayasankar  and M. F. Reid",
  title = 	 "Analysis of spectral data and comparative energy level
  parametrizations for {Ln$^{3+}$} in cubic elpasolite crystals",
  journal =	 JAC,
  year =	 1994,
  volume =	 "{\bf 215}",
  pages =	 "349--370"
}

@Article{DeJaRe94b,
  author = 	 "A. R. Devi and C. K. Jayasankar and M. F. Reid",
  title = 	 "Correlation crystal--field analysis of 
      {Sm$^{3+}$:Na$_3$(Sm(Oxydiacetate)$_3$)$\cdot$2NaClO$_4\cdot$6H$_2$O}",
  journal =	 "Phys. Rev. B",
  year =	 1994,
  volume =	 "{\bf 49}",
  pages =	 "12551--12555"
}

@Article{ChTaRe94,
  author = 	 "M. Chua and P. A. Tanner and M. F. Reid",
  title = 	 "Energy-transfer by electric dipole--magnetic dipole
  interaction in cubic crystals",
  journal =	 "Solid State Comm.",
  year =	 1994,
  volume =	 "{\bf 90}",
  pages =	 "581--583"
}

@article      {BJRR94,
author      = "G. W. Burdick and C. K. Jayasankar and F. S. Richardson
               and M. F. Reid",
year        = 1994,
title       = "Energy--level and line--strength analysis of optical 
               transitions between Stark levels in 
               {Nd$^{3+}$:Y$_3$Al$_5$O$_{12}$}",
journal     = "Phys. Rev. B",
volume      = "{\bf 50}",
pages       = "16$\, $309--16$\, $325"
}

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@Article{FGP89,
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@Article{BR98b,
  author = 	 "G. W. Burdick and F. S. Richardson",
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@Article{RJR94,
  author = 	 "E. Rukmini and C. K. Jayasankar and M. F. Reid",
  title = 	 "Correlation-crystal-field analysis of the {Nd$^{3+}$($4f^3$)}
                   energy-level structures in various crystal hosts",
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@Article{SLR95,
  author = 	 "Simoni, E. and  
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                 Hubert, S. and 
                 Reid, M. F.",
  title = 	 "Parametrization of {5f-5f} Transition Probabilities Between
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  year =	 1995,
  volume =	 "{\bf 5}",
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@Article{TCR95,
  author = 	 "P. A. Tanner and M. Chau and M. F. Reid",
  title = 	 "Energy transfer between lanthanide ions in elpasolite lattices",
  journal =	 JAC,
  year =	 1995,
  volume =	 "{\bf 225}",
  pages =	 "20--23"}

@Article{TKJR95,
  author = 	 "P.  A.  Tanner and V. V. R. K. Kumar and C.  K.
		  Jayasankar and M.  F.  Reid",
  title = 	 "Comparative energy level parametrizations for
		  lanthanide ions in octahedral symmetry environments",
  journal =	 JAC,
  year =	 1995,
  volume =	 "{\bf 225}",
  pages =	 "85--88"}

@article      {BRRK95,
author      = "G. W. Burdick and F. S. Richardson and M. F. Reid and
               H. J. Kooy",
year        = 1995,
title       = "Direct calculation of lanthanide optical transition intensities:
    {Nd$^{3+}$:YAG}",
journal     = "J. Alloys Compd.",
volume      = "{\bf 225}",
pages       = "115--119"}

@Article{MRB96,
  author =       " L. F. McAven and M. F. Reid and P. H. Butler",
  title =        "Transformation properties of the delta function model
                  of correlation crystal fields",
  journal =      "J. Phys. B",
  year =         1996,
  volume = "{\bf 29}",
  pages =        "1421--1431",
  note = "Corrigenda: 4319"               
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@Article{FCLBGR96,
  author = 	 " L. Fluyt and I. Couwenberg and H. Lambaerts and K.
		  Binnemans  and C. {G\"{o}rller}-Walrand and M. F. Reid",
  title = 	 "Magnetic circular dichroism of {Na$_3$Nd(ODA)$_3$ 
           $\cdot$ 2NaClO$_4$ $\cdot$ 6H$_2$O}",
  journal =	 "J. Chem. Phys.",
  year =	 1996,
  volume =	 "{\bf 105}",
  pages =	 "6117--6127"
}
		  
@article      {CrReTaZh97,
author      = "S. M. Crooks and M. F. Reid and P. A. Tanner and Y. Y. Zhao",
year        = 1997,
title       = "Vibronic intensity parameters for {Er$^{3+}$} 
                   in {Cs$_2$NaErCl$_6$}",
journal     = "J. Alloys Compd.",
volume      = "",
pages       = "",
note        = "In Press"}

@article      {McRe97,
author      = "D. P. McLeod and M. F. Reid",
year        = 1997,
title       = "Intensities of hyperfine transitions of {Pr$^{3+}$} and
                 {Ho$^{3+}$} in {CaF$_2$}",
journal     = "J. Alloys Compd.",
volume      = "",
pages       = "",
note        = "In Press"
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@article{WA99,
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  year =	 1995,
  volume =	 "{\bf 201}",
  pages =	 "321-342"}