-
[1]
A.A. Belavin, A. M. Polyakov and A. B. Zamolodchikov, Nucl. Phys.. B241(1984), 333.[2] A.Tsucbiya and Y. Kanie Adv., Studies in Putc Math. 16(1988). 297; Lett. Math. Phys., 13(1987), 303.[3] G.V. Kwiznic and A. B. Zamolodchikov, Nucl. Phys., B247(1984)，83.[4] P.Christ and R. Flume, Nucl. Phys., B282(1987), 466.[5] E.Witten, Comm. Math. Phys., 121(1989), 351; IASSNS-HEP89/11, 89/32.[6] J.M. F. Labstida and A. V. Ramallo, CERN-TH5432/89; Phys. Lett., B227(1989), 92.[7] G.Moore and Seiberg, IASSNS-HEP-88/8; Nucl. Phys., B313(1989), 16.[8] L. Alvarez-Gaume, C. Gomez and G. Sierra.CERN-TH5129/88, Phys. Lett., B220(1989), 142.[9] Goddard, Kent and Olive, Comm. Math. Phys,103(1987), 105.[10] VI. S. Dotzenko and Fateev, Nucl. Phys., B240(1984), 312; B251(1985), 691;Phys. Lett., B154(1985),291.[11] B. Y.Hou,D.P. Li and R. H. Yue, Phys .Lett., B229(1989), 45.[12] B. Y.Hou,J. Shi, P. Wang, and R.H. Yue. NWU-IMP-89-1219