Boyce, William E. Elementary differential equations and boundary value problems / William E. Boyce, Richard C. DiPrima. - 5th ed. - New York : J. Wiley, c1992. - xv, 680, 7 p. : ill. ; 24 cm. Includes bibliographical references and index. ISBN: 0471509981 Subjects--Topical Terms: Differential equations.Boundary value problems. Dewey Class. No.: 515.35 / BOE