Friedman, Avner Partial differential equations/ Avner Friedman. - New York: Holt, Rinehart and Winston, [1969]. - 262 p.: 25 cm. Bibliography: p. 255-260. ISBN: 0030774551 LCCN: 69019015 Nat. Bib. No.: GB70-2880 Subjects--Topical Terms: Differential equations, Partial. Dewey Class. No.: 515.45 / F911p