Boyce, William E. Elementary differential equations and boundary value problems - 2d ed. - New York, Wiley [1969] - xiv, 533, A-43, I-8 p. illus. 24 cm. ISBN: 471093319 Subjects--Topical Terms: Differential equations.Boundary value problems. Dewey Class. No.: 517 ELE 1969 C282 Or.