no. 4
On nontrivial solutions of a semilinear wave equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 647-657 
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     author = {Rabinowitz, Paul H.},
     title = {On nontrivial solutions of a semilinear wave equation},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {647--657},
     year = {1981},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 8},
     number = {4},
     mrnumber = {656003},
     zbl = {0484.35012},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1981_4_8_4_647_0/}
}
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Rabinowitz, Paul H. On nontrivial solutions of a semilinear wave equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 647-657. https://www.numdam.org/item/ASNSP_1981_4_8_4_647_0/

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