Williams, William Elwyn Partial differential equations W. E. Williams - Oxford [Eng.] New York Clarendon Press Oxford University Press 1980 - xi, 357 p graphs 22 cm - Oxford applied mathematics and computing science series . Contine index ISBN: 0198596324 0198596332 (pbk.) LCCN: 79041197 Subjects--Topical Terms: Differential equations, Partial Dewey Class. No.: 515.3/53