@article{1214431964, author = {Cheeger, Jeff}, title = {Some examples of manifolds of nonnegative curvature}, journal = {J. Differential Geom.}, volume = {8}, number = {3}, year = {1973}, pages = { 623-628}, language = {en}, url = {http://dml.mathdoc.fr/item/1214431964} }
Cheeger, Jeff. Some examples of manifolds of nonnegative curvature. J. Differential Geom., Tome 8 (1973) no. 3, pp. 623-628. http://gdmltest.u-ga.fr/item/1214431964/