• [1]

    I. Affleck and J. B Marston, Phys. Rev. ,B37(1988),3774;B39(1989),1538;R.,Shankar, Phys. Rev. Lett. ,63(1989),203; E. Daaotto,E. Frodkin and A. More,Phys. Rev. ,B38(Y989),2926.[2]A. J. Niemi and G. W. Semanoff,Phys. Rev. Lett. ,51(1983),2077.[3]M. G. Mitchard, J. A. Gracey and A. J. Macfarlane, Nucl. Phys. ,B315(1989),470;I. Yotsuyanagi,Phys. Rev.D39(1989),3034.[4]A. D. Davis,J. A. Gracey and A. J. Macfarlane, Nucl. Phys. ,B195(FS21) (1988),617.[5]B. Rosenstein and A. Kover,Phys. Rev. , D40 (1989 ) , 523.[6]K. Shizuya, Phys. Rev. ,D11(1980)2327;B. Rosenstein, B. J. Warr and S. H. Park,Phys. Rev. Lett. ,62(1989)1433.[7]S. Coleman, Commun. Math. Phys. , 31(1973 ) , 259.[8]B. Rosenstein and B. J. Warr,Phys. Lev.Lett. ,Z18B(1989),465.[9]M. Carena,T. E. Clark.“C. E. M. Wagner , Nucl. Phys. , B356 (1991) ,117.[10]沈坤、裘忠平,高能物理与核物理,16(1992),29;Shen Kun and Qiu Zhongping,Journal of Phys. ,18(1992),745.