@article{1183507545, author = {Chern, Shiing-Shen}, title = {On Riemannian manifolds of four dimensions}, journal = {Bull. Amer. Math. Soc.}, volume = {51}, number = {11}, year = {1945}, pages = { 964-971}, language = {en}, url = {http://dml.mathdoc.fr/item/1183507545} }
Chern, Shiing-Shen. On Riemannian manifolds of four dimensions. Bull. Amer. Math. Soc., Tome 51 (1945) no. 11, pp. 964-971. http://gdmltest.u-ga.fr/item/1183507545/