Boyce, William E. Elementary differential equations and boundary value problems/ William E. Boyce and Richard C. DiPrima. - 3rd ed. - New York: London: Wiley, 1977. - xv, 582, A48, I8 p.: ill.; 24 cm. With answers. Previous ed.: 1969. Includes bibliographies and index. ISBN: 0471093343 : ª12.50 LCCN: gb 78000256 Nat. Bib. No.: GB78-256 Subjects--Topical Terms: Differential equations.Boundary value problems. Dewey Class. No.: 515.35 / B789e