Gelʹfand, I. M. Calculus of variations / I. M. Gelfand, S. V. Fomin ; translated and edited by Richard A. Silverman. - Mineola, NY : Dover Publications, 2000. - vii, 232 p. : ill. ; 22 cm. Originally published: Englewood Cliffs, NJ : Prentice-Hall, 1963. ISBN: 0486414485 (pbk.) 9780486414485 (pbk.) Subjects--Topical Terms: Calculus of variations. Dewey Class. No.: 515.64 / GEL 2000