• [1]

    A.A.Belavin,Nucl.Phys.,B180(1981)189.[2] M.P.Richey,C.A.Tracy,J.Stat.Phys.,42(1986)311.[3] E.K.Sklyanin,J.Phys.,A21(1988)2375.[4] B.Y.Hou,K.J.Shi,H.Fanetal.,Commun.Theor.Phys.,23(1995)163.[5] P.P.Kulish,E.K.Sklyanin,J.Phys.,A24(1991)L435.[6] L.Mezincescu,R.I.Nepomechie,Nucl.Phys.,B372(1992)597.