Elsgolts, L.
Differential equations and the calculus of variations / L. Elsgolts ; translated by George Yankovosky. - Moscow : Mir publishers, c1977. - 440 pages : illustrations ; 22 cm.
Differential equations.
515.35 ELS
Differential equations and the calculus of variations / L. Elsgolts ; translated by George Yankovosky. - Moscow : Mir publishers, c1977. - 440 pages : illustrations ; 22 cm.
Differential equations.
515.35 ELS