Integrable systems,quantum groups,and quantum field theories : Proc.of the NATO advanced study inst.and XXIII GIFT intern.seminar on recent problems in mathematical physics,June 15-27,1992,Salamanca / ed.: L. A. Ibort, M. A. Rodr@wiguez, 1993. - XI,502 p. p. - Текст : непосредственный.