@article{1183494156, author = {Graustein, W. C.}, title = {Invariant methods in classical differential geometry}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 489-521}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494156} }
Graustein, W. C. Invariant methods in classical differential geometry. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 489-521. http://gdmltest.u-ga.fr/item/1183494156/