Integrable systems and quantum groups : lectures given at 1st. session of the Centro internazionale matematico estivo (C.I.M.E) held in Montecatine Terme, Italy, June 14-22, 1993 - Donagi, Ron; Dubrovin, Boris; Frenkel, Edward; Previato, Emma; Francaviglia, Mauro; Greco, Silvio, 1941- (Lecture notes in mathematics ;, 1966)