Global geometry and mathematical physics lectures given at the 2nd session of the Centro internazionale matematico estivo (C.I.M.E.) held at Montecatini Terme, Italy, July 4-12, 1988 / L. Alvarez-Gaume ... [et al.] ; editors, M. Francaviglia, F. Gherardelli. - Alvarez-Gaume, Luis; Francaviglia, M.; Gherardelli, F. (Francesco), 1925- (Lecture notes in mathematics (Springer-Verlag), 1990)