@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/