Boyce, William E. Elementary differential equations and boundary value problems / [by] William E. Boyce and Richard C. Di Prima. - New York : J. Wiley, c1965 - xvi, 485 p. : illus. ; 24 cm. Includes Bibliographical reference and index. Subjects--Topical Terms: Differential equations.Boundary value problems. Dewey Class. No.: 517.38 / BOE 1965