@article{1183502552, author = {Johnson, Marie M.}, title = {An extension of a covariant differentiation process}, journal = {Bull. Amer. Math. Soc.}, volume = {46}, number = {11}, year = {1940}, pages = { 269-271}, language = {en}, url = {http://dml.mathdoc.fr/item/1183502552} }
Johnson, Marie M. An extension of a covariant differentiation process. Bull. Amer. Math. Soc., Tome 46 (1940) no. 11, pp. 269-271. http://gdmltest.u-ga.fr/item/1183502552/