Heading, John. Ordinary differential equations : theory and practice : an elementary, integrated, applied treatment based on the wave equation / by John Heading. - London : Elek, 1975. Includes index. Bibliography: p. 332. ISBN: a13.1..1.11 a13.2..1.17 L.3.50 LCCN: 75327455 Nat. Bib. No.: GB75-12572 Subjects--Topical Terms: Differential equations.Wave equation. LC Class. No.: QA372 / .H433 1975 Dewey Class. No.: 515/.352