Spiegel, Murray R. Schaum's outline of theory and problems of calculus of finite differences and difference equations / Murray R. Spiegel. - New York : McGraw-Hill, c1971. - vi,259p. : ill. ; 28 cm. - Schaum's outline series . Includes index. english ISBN: 0070602182 LCCN: 74151500 Subjects--Topical Terms: Difference equations. LC Class. No.: QA431 / .S62 Dewey Class. No.: 515.620202/SPS