• [1]

    Du dongsheng, Ma Zhongqi, Xue Peiyou and Yue Zhongwu, Scientia Sinica, 26(1981), 1358;Du Dongsheng, M a Zhongqi, Xue Peiyou and Yue Zhongwu, ibid., 26(1981), 1366; Zhonggi Ma.Tung-sheng Tu, Pei-you Xue and Xian-jiau Zhou, Phys. Lett., 100B(1981),399.[2] L. E. Ibanez, Reprint of University of Oxford, Ref., 25/81; L. E. Ibanez, ibid Ref., 40/81;D. Wyler, Phys. Lett., 105B(1981),426; C. H. Llewellyn et al., Phys. Lett., 105B(1981),31.[3] S. M. Barr, Phys. Rev., D21(1980),1424.[4] H. Georgi and S. L. Glashow, Phys. Rev. Lett., 32(1974),438.[5] H. Georgi, Nucl. Phys., B156(1979), 126; R. Barbieri et al., Phys. Lett., 91B(1980),369; FLBarbieri et al., ibid., 90B(1980),91.