Postnikov, M. M. The variational theory of geodesics/ [by] M.M. Postnikov; Translated by Scripta Technica. Edited by Bernard R. Gelbaum. - Philadelphia: Saunders, 1967. - viii, 200 p.: 24 cm. - Saunders mathematics books . LCCN: 66026061 //r84 Nat. Bib. No.: GB67-3912 Subjects--Topical Terms: Calculus of variations.Geometry, Differential. Dewey Class. No.: 516.36 / P858v