Index estimates and critical points of functionals not satisfying Palais-Smale
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 4, pp. 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},
     pages = {569--581},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 17},
     number = {4},
     year = {1990},
     mrnumber = {1093709},
     zbl = {0725.58019},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1990_4_17_4_569_0/}
}
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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, Série 4, Tome 17 (1990) no. 4, pp. 569-581. http://archive.numdam.org/item/ASNSP_1990_4_17_4_569_0/

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