D-Modules and Microlocal Geometry: Proceedings of the International Conference on D-Modules and Microlocal Geometry held at the University of Lisbon (Portugal), October 29-November 2, 1990

D-modules, Representation Theory, and Quantum Groups: Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Venezia, Italy, June 12-20, 1992