@article{1183517666, author = {Rothe, E. H.}, title = {Gradient mappings}, journal = {Bull. Amer. Math. Soc.}, volume = {59}, number = {6}, year = {1953}, pages = { 5-19}, language = {en}, url = {http://dml.mathdoc.fr/item/1183517666} }
Rothe, E. H. Gradient mappings. Bull. Amer. Math. Soc., Tome 59 (1953) no. 6, pp. 5-19. http://gdmltest.u-ga.fr/item/1183517666/