1. A. C. Williams:Int. J. Theor. Phys.,22, 219 (1983).
2. C. L. Crithfield:Am. J. Phys.,32, 542 (1964).
3. H. J. Korsh andR. Mohlenkamp:Phys. Lett. A,67, 110 (1978).
4. E. Durand:Mecanique Quantique, vol.1 (Masson et Cie, Paris, 1978), chapt. 6;H. Horiuchi:Progr. Theor. Phys.,64, 184 (1980).
5. D. Bohm:Quantum Theory (Prentice Hall, Englewood Cliffs, WJ, 1951), chapt. 12.