Wan, Frederick Y. M. Introduction to the calculus of variations and its applications / Frederick Y.M. Wan. - New York : Chapman & Hall, c1995. - xviii, 638 p. : ill. ; 24 cm. Includes index. Includes bibliographical references : p. 621-625. ISBN: 0412051419 (cased) Subjects--Topical Terms: Calculus of variations.