Pseudo-differential operators proceedings of a conference held in Oberwolfach, February 2-8, 1986 / edited by H.O. Cordes, B. Gramsch, and H. Widom. - Cordes, H. O. (Heinz Otto), 1925-; Gramsch, B. (Bernhard), 1938-; Widom, Harold, 1932- (Lecture notes in mathematics (Springer-Verlag), 1987)