Spiegel, Murray R. Applied differential equations. - Englewood Cliffs, N.J.: Prentice-Hall, 1958. - 381 p.: illus., 24 cm. - Prentice-Hall mathematics series . LCCN: 58007394 /L/r84 Subjects--Topical Terms: Differential equations. Dewey Class. No.: 515.35 / S755a