Schneider, 1951, Physica, 17, 221, 10.1016/0031-8914(51)90062-6
Van Wieringen, 1955, Disc. Faraday Soc., 19, 118, 10.1039/df9551900118
Heine, 1957, Phys. Rev., 107, 1002, 10.1103/PhysRev.107.1002
Wood, 1957, Phys. Rev., 107, 995, 10.1103/PhysRev.107.995
Watson, 1961, Phys. Rev., 123, 2027, 10.1103/PhysRev.123.2027
Matumura, 1959, J. phys. Soc. Japan, 14, 108, 10.1143/JPSJ.14.108
Hannay, 1946, J.Am. Chem. Soc., 68, 171, 10.1021/ja01206a003
Gordy, 1956, J. chem. Phys., 24, 439, 10.1063/1.1742493
Abragam, 1955, Proc. R. Soc., 230, 169, 10.1098/rspa.1955.0120
Estle, 1966, Phys. Rev., 150, 159, 10.1103/PhysRev.150.159
Hubbard, 1966, Proc. Phys. Soc., 88, 13, 10.1088/0370-1328/88/1/304
Kasai, 1968, Phys. Rev. Lett., 21, 67, 10.1103/PhysRevLett.21.67
Woodbury, 1960, Phys. Rev. Lett., 5, 96, 10.1103/PhysRevLett.5.96
Henning, 1967, Physics Lett., 24A, 40, 10.1016/0375-9601(67)90184-3
Anderson, 1963, Solid St. Phys., 14, 99, 10.1016/S0081-1947(08)60260-X
Šimánek, 1966, Phys. Lett., 21, 625, 10.1016/0031-9163(66)90097-7
Ikeya, 1969, Solid State Comm., 7, 355, 10.1016/0038-1098(69)90418-9
STEUDEL H., Private communication.
Moore, 1952, Atomic Energy Levels, Vol. II
Schirmer, 1968, J. Phys. Chem. Solids, 29, 1407, 10.1016/0022-3697(68)90193-5
Šimánek, 1967, Phys. Rev., 163, 275, 10.1103/PhysRev.163.275
Geschwind, 1962, Phys. Rev., 126, 1684, 10.1103/PhysRev.126.1684
Lacroix, 1962, Helv. phys. Acta, 35, 592
Phillips, 1969, Phys. Rev. Lett., 22, 705, 10.1103/PhysRevLett.22.705