Boyce, William E. Elementary differential equations and boundary value problems / William E. Boyce and Richard C. DiPrima. - 5th ed. - New York : Wiley, 1992. - xv, 680, I-7 p. : ill. ; 25 cm. Includes bibliographical references and index. ISBN: 0471509981 Subjects--Topical Terms: Differential equations.Boundary value problems. Dewey Class. No.: 515.35 / BOE