Gelfand,I.M.
Calculus of variations / with applications to physics and engineering. - New York : McGraw-Hill, 1952. - 326 p.
Calculus of variations.
514.4 / GEC
Calculus of variations / with applications to physics and engineering. - New York : McGraw-Hill, 1952. - 326 p.
Calculus of variations.
514.4 / GEC