Microlocal analysis and applications : lectures given at the 2nd session of the Centro internazionale matematico estivo (C.I.M.E.) held at Montecatini Terme, Italy, July 3-11, 1989 - Centro internazionale matematico estivo. Session; Bony, J. M.; Cattabriga, Lamberto; Grubb, Gerd; Hörmander, Lars; 小松, 彦三郎; Sjöstrand, J. (Johannes); Rodino, L. (Luigi) (Lecture notes in mathematics, 1991)