@article{1077380101, author = {Avez, Andr\'e}, title = {Riemannian manifolds with non-negative Ricci curvature}, journal = {Duke Math. J.}, volume = {39}, number = {1}, year = {1972}, pages = { 55-64}, language = {en}, url = {http://dml.mathdoc.fr/item/1077380101} }
Avez, André. Riemannian manifolds with non-negative Ricci curvature. Duke Math. J., Tome 39 (1972) no. 1, pp. 55-64. http://gdmltest.u-ga.fr/item/1077380101/