Lax, Peter D. Partial differential equations: Lecture notes/ by J. Berkowitz and A. and P. Lax, 1950-51. Supplementary notes by Avron Doublis. - [New York]: New York University/Institute of Mathematical Sciences, [1952?]. - 241, 35 p.: illus., 27 cm. Subjects--Topical Terms: Differential equations, Partial. Dewey Class. No.: 515.35 / L425p