@article{1077473104, author = {Chern, Shiing-shen}, title = {Some new characterizations of the Euclidean sphere}, journal = {Duke Math. J.}, volume = {12}, number = {1}, year = {1945}, pages = { 279-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1077473104} }
Chern, Shiing-shen. Some new characterizations of the Euclidean sphere. Duke Math. J., Tome 12 (1945) no. 1, pp. 279-290. http://gdmltest.u-ga.fr/item/1077473104/