1. Aratyn, H. (1983).Nuclear Physics B,227, 172.
2. Barut, A. O. (1984). Unification based on electromagnetism, Talk presented at the Symposium on Unification, Caputh.
3. Bjorken, J. D., and Drell, S. D. (1965).Relativistic Quantum Fields, McGraw-Hill, New York.
4. Cabibbo, N., and Ferrari, E. (1962).Nuovo Cimenta,23, 1147.
5. Garbaczewski, P. (1975).Communications in Mathematical Physics,43, 131.