**The Analysis of Linear Partial Differential Operators III: Pseudo-Differential Operators (Classics in Mathematics) by Lars Hörmander**

Springer; Reprint of the 1st ed. 1985. Corr. 2nd printing Berlin Heidelberg New York 1994 edition | March 15, 2007 | English | ISBN: 3540499377 | 537 pages | PDF | 23 MB

"Volumes III and IV complete L. Hörmander's treatise on linear partial differential equations. They constitute the most complete and up-to-date account of this subject, by the author who has dominated it and made the most significant contributions in the last decades.....It is a superb book, which must be present in every mathematical library, and an indispensable tool for all - young and old - interested in the theory of partial differential operators." L. Boutet de Monvel in Bulletin of the American Mathematical Society, 1987.