@article{1183497247, author = {Levy, Harry}, title = {Curvatures in Riemannian space}, journal = {Bull. Amer. Math. Soc.}, volume = {40}, number = {12}, year = {1934}, pages = { 75-78}, language = {en}, url = {http://dml.mathdoc.fr/item/1183497247} }
Levy, Harry. Curvatures in Riemannian space. Bull. Amer. Math. Soc., Tome 40 (1934) no. 12, pp. 75-78. http://gdmltest.u-ga.fr/item/1183497247/