• [1]

    M. Gell-Mann and M. Levy, Nuouo Cimenzo, 16(1960), 705.[2] Liu Bao-hua and Li Jia-rong, Phys. Rev., D37(1988), 190.[3] C. Itzykson and J. B. Zuber, Quantum Field Theory, McGraw-Hill, New York, 1980.[4] E. S. Abers and B. W. Lee, Phys. Rep., C9(1973), 1.[5] J Y. Nambu and G. Jona-Lasinio, Phys. Rev., 122(1961), 345; 124(1961), 246.