BOYCE, William E. Diprima, Richard C. Elementary differential equations /[by] William E. Boyce, Richard C. Diprima - 3rd ed. - New York John Wiley 1977 - xiv, 451 p. Index: I1-I7. ISBN: 471093394 Subjects--Topical Terms: Differential equations Dewey Class. No.: 515.35 / BOY