-
[1]
D. Gonzales, Phys. Lett., 129B(1983), 213.[2] H. Georgi, Nucl. Phys., B156(1972), 126.[3] J. Preskill and S. Weinberg, Phys. Rev. D24 (1981) , 1059.[4] Panda, S, U. Sarker, Phys. Lett. B139(1984), 42.[5] Z. Q. Ma. T. S. Tu,P. Y. Xue and X. T. Zhou, Phys. Lett., B100(1981), 399.[6] G' tHooft, Proceeding of the cargese summer Institute (1979).[7] Masakuri Ida, P}rog. Theor. Phys., V69,(1983), 1554.[8] H. Harari, N. Seinberg, Phys. Lett., 115B, (1982) , 450.