@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/