Index estimates and critical points of functionals not satisfying Palais-Smale
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 17 (1990) no. 4, p. 569-581
@article{ASNSP_1990_4_17_4_569_0,
author = {Coti Zelati, Vittorio and Ekeland, Ivar and Lions, Pierre-Louis},
title = {Index estimates and critical points of functionals not satisfying Palais-Smale},
journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
publisher = {Scuola normale superiore},
volume = {Ser. 4, 17},
number = {4},
year = {1990},
pages = {569-581},
zbl = {0725.58019},
mrnumber = {1093709},
language = {en},
url = {http://www.numdam.org/item/ASNSP_1990_4_17_4_569_0}
}

Coti Zelati, Vittorio; Ekeland, Ivar; Lions, Pierre-Louis. Index estimates and critical points of functionals not satisfying Palais-Smale. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 17 (1990) no. 4, pp. 569-581. http://www.numdam.org/item/ASNSP_1990_4_17_4_569_0/

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