Operational mathematics [by] Ruel V. Churchill. Modern operational mathematics in engineering Churchill, Ruel V. (Ruel Vance), 1899-1987. Integral transforms. Differential equations. Calculus, Operational. QA432 .C45 1972 510 CHO First ed. published in 1944 under title: Modern operational mathematics in engineering. Bibliography: p. 456-457. New York : McGraw-Hill, c1972. c1972. 1971 Text xii, 481 p. : eng