1. The use of forms in variational calculations;Auslander, Louis;Pacific J. Math.,1955
2. Spaces with non-positive curvature;Busemann, Herbert;Acta Math.,1948
3. E. Cartan, Les espaces de Finsler, Actualités Scientifiques et Industrielles, no. 79, Paris, Hermann, 1934.
4. On the Euclidean connections in a Finsler space;Chern, Shiing-shen;Proc. Nat. Acad. Sci. U.S.A.,1943
5. Riemannian manifolds with positive mean curvature;Myers, S. B.;Duke Math. J.,1941