1. Berezin, F. A.The Method of Second Quantization. Academic Press, New York.
2. Bergmann, P. G. and Goldberg, I. (1955).Physical Review,98, 531.
3. Bjorken, J. D. and Drell, S. D. (1964).Relativistic Quantum Mechanics. McGraw-Hill Book Company, New York.
4. Bjorken, J. D. and Drell, S. D. (1965).Relativistic Quantum Fields. McGraw-Hill Book Company, New York.
5. Case, K. M. (1957).Physical Review,107, 307.