no. 1
Some critical point theorems and applications to semilinear elliptic partial differential equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 5 (1978) no. 1, pp. 215-223. 
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     author = {Rabinowitz, Paul H.},
     title = {Some critical point theorems and applications to semilinear elliptic partial differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {215--223},
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     number = {1},
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     url = {http://archive.numdam.org/item/ASNSP_1978_4_5_1_215_0/}
}
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Rabinowitz, Paul H. Some critical point theorems and applications to semilinear elliptic partial differential equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 5 (1978) no. 1, pp. 215-223. http://archive.numdam.org/item/ASNSP_1978_4_5_1_215_0/

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