L. E. Erickson, 1977, Opt. Commun., 21, 147, 10.1016/0030-4018(77)90097-9
N. Takeuchi, 1974, Phys. Lett., 50A, 361, 10.1016/0375-9601(74)90061-9
Y. C. Chen, 1976, Phys. Lett., 58A, 201, 10.1016/0375-9601(76)90289-9
R. M. Macfarlane, 1979, Phys. Rev. Lett., 43, 1726, 10.1103/PhysRevLett.43.1726
R. G. DeVoe, 1979, Phys. Rev. Lett., 42, 1560, 10.1103/PhysRevLett.42.1560
K. Chiang, 1981, Phys. Rev. B, 23, 6142, 10.1103/PhysRevB.23.6142
R. M. Macfarlane, 1980, Opt. Commun., 32, 101, 10.1016/0030-4018(80)90323-5
S. Matthies, 1975, Phys. Status Solidi B, 68, 125, 10.1002/pssb.2220680110
L. O. Andersson, 1968, Z. Kristallogr., 127, 366, 10.1524/zkri.1968.127.16.366
V. K. Sharma, 1971, J. Chem. Phys., 54, 496, 10.1063/1.1674869
J. M. Baker, 1961, Proc. Phys. Soc. London, 78, 1353, 10.1088/0370-1328/78/6/338
L. O. Andersson, 1968, Z. Kristallogr., 127, 386
I. Oftedal, 1931, Z. Phys. Chem. Abt. B, 13, 190, 10.1515/zpch-1931-1315
K. Schlyter, 1952, Ark. Kemi, 5, 73
M. Mansmann, 1965, Z. Kristallogr., 122, 375, 10.1524/zkri.1965.122.5-6.375
A. Zalkin, 1966, Inorg. Chem., 5, 1466, 10.1021/ic50042a047
C. de Rango, 1966, C. R. Acad. Sci. C, 263, 64
M. A. Teplov, 1967, Zh. Eksp. Teor. Fiz., 53, 1510
L. E. Erickson, 1980, Rev. Sci. Instrum., 51, 1095, 10.1063/1.1136369
R. M. Shelby, 1978, Opt. Commun., 27, 399, 10.1016/0030-4018(78)90408-X
Y. C. Chen, 1979, Opt. Commun., 29, 181, 10.1016/0030-4018(79)90012-9
D. T. Edmonds, 1963, Phys. Rev. Lett., 10, 129, 10.1103/PhysRevLett.10.129
S. Hüfner, 1978, Optical Spectra of Transparent Rare Earth Compounds
Y. C. Chen, 1978, Opt. Commun., 26, 269, 10.1016/0030-4018(78)90069-X
A. Wokaun, 1981, Phys. Rev. B, 23, 5733, 10.1103/PhysRevB.23.5733
K. K. Sharma, 1981, J. Phys. C, 14, 1329, 10.1088/0022-3719/14/9/017
K. Lee, 1965, Phys. Rev. Lett., 14, 1027, 10.1103/PhysRevLett.14.1027
