• [1]

    Zhang Zong-ye and Yu You-wen, Commun. in Theor. Phys., 1(1982), 783; 2(1983), 1357;余友文、张宗烨, 高能物理与核物理, 7(I983), 575.[2] M. Oka and K. Yazaki, Phys. Lett., 90B (1980 ) , 41.[3] M, M. Nagels et al., Nucl. Phys., B147(1979), 189.