BOYCE, William E Diprima, Richard C. Elementary Differential equations and boundary value problems / [by] William E.Boyce, Richard C.Diprima - 4th ed. - New York John Wiley & sons 1986 - xvi, 654 p. Index: p.I1-I8 ISBN: 471838241 Subjects--Topical Terms: Differential equations Dewey Class. No.: 515.35 / BOY