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Quesne C. J. Phys., 1988, A21:3093 2 Victoria M. et al Phys Lett., 1989, A134(7):3953 Cooper F, Khare A, Sukhatme U. Phys. Rep., 1995, 251:3094 Dutt R, Khare A, Sukhatme U. Am. J. Phys., 1988, 56:166
Quesne C. J. Phys., 1988, A21:3093 2 Victoria M. et al Phys Lett., 1989, A134(7):3953 Cooper F, Khare A, Sukhatme U. Phys. Rep., 1995, 251:3094 Dutt R, Khare A, Sukhatme U. Am. J. Phys., 1988, 56:166