1. J. D. Edmonds, Jr.,Int. J. Theoret. Phys.
6, 205 (1972).
2. P. Rastall,Rev. Mod. Phys.
36, 820 (1964).
3. L. M. Brown, inLectures in Theoretical Physics, Vol. IV (Interscience, New York, 1962).
4. J. D. Edmonds, Jr., submitted toPhys. Rev.
5. J. D. Edmonds, Jr.,Am. J. Phys., to be published.