Roy, 1969, Indian J. Pur. Appl. Phys., 7, 306
Santana, 1973, Am. J. Phys., 41, 1138, 10.1119/1.1987504
Eldib, 1987, J. Phys. C, 20, 3011, 10.1088/0022-3719/20/20/008
Gasparian, 1988, Phys. Lett. A, 132, 201, 10.1016/0375-9601(88)90284-8
Dominguez-Adame, 1989, J. Phys. Condens. Mat., 1, 109, 10.1088/0953-8984/1/1/009
Erdös, 1977, Helv. Phys. Acta, 50, 513
Knight, 1963, Phys. Rev., 132, 1085, 10.1103/PhysRev.132.1085
Glasser, 1977, Surf. Sci., 64, 141, 10.1016/0039-6028(77)90263-1
Calkin, 1988, Phys. Rev. C, 38, 1076, 10.1103/PhysRevC.38.1076
Glasser, 1983, Am. J. Phys., 51, 936, 10.1119/1.13389
Madelung, 1987, Introduction to Solid State Theory, 91
Calkin, 1987, Am. J. Phys., 55, 737, 10.1119/1.15031
Domínguez-Adame, 1989, J. Phys. A, 22, L419, 10.1088/0305-4470/22/10/001
Domínguez-Adame, 1990, J. Phys. A, 22, 1993, 10.1088/0305-4470/23/11/023
Glasser, 1970, Int. J. Quantum Chem., IIIS, 867
Méndez, 1991, J. Phys. A, 24, L331, 10.1088/0305-4470/24/7/004
Domínguez-Adame, 1991, Phys. Lett. A, 159, 153, 10.1016/0375-9601(91)90263-8
McKellar, 1987, Phys. Rev. C, 35, 2262, 10.1103/PhysRevC.35.2262
Saxon, 1949, Philips Res. Rep., 4, 81
Luttinger, 1951, Philips Res. Rep., 6, 303
Subramanian, 1971, Phys. Stat. Sol. (b), 48, 399, 10.1002/pssb.2220480139
Mladenov, 1989, Phys. Lett. A, 137, 313, 10.1016/0375-9601(89)90896-7
