Variational Theory of Geodesics, , Dover Publications, Bernard R. Gelbaum, M. M. Postnikov,Differential and Riemannian geometry,Geometry, Riemannian mathematics, Riemannian spaces, geodesics, variational properties, differential geometry, Morse theory. theorems,, Dover Books on Mathematics, United States, en-UShttps://www.doverpublications.comRiemannian mathematics, Riemannian spaces, geodesics, variational properties, differential geometry, Morse theory. theorems, [BLURB],[CITY],New York,books, ebooks, biblet, Book2look