@article{1077474854, author = {Rothe, E. H.}, title = {Gradient mappings and extrema in Banach spaces}, journal = {Duke Math. J.}, volume = {15}, number = {1}, year = {1948}, pages = { 421-431}, language = {en}, url = {http://dml.mathdoc.fr/item/1077474854} }
Rothe, E. H. Gradient mappings and extrema in Banach spaces. Duke Math. J., Tome 15 (1948) no. 1, pp. 421-431. http://gdmltest.u-ga.fr/item/1077474854/