@article{1183548116,
author = {Nirenberg, L.},
title = {Variational and topological methods in nonlinear problems},
journal = {Bull. Amer. Math. Soc. (N.S.)},
volume = {4},
number = {1},
year = {1981},
pages = { 267-302},
language = {en},
url = {http://dml.mathdoc.fr/item/1183548116}
}
Nirenberg, L. Variational and topological methods in nonlinear problems. Bull. Amer. Math. Soc. (N.S.), Tome 4 (1981) no. 1, pp. 267-302. http://gdmltest.u-ga.fr/item/1183548116/