Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 7 (1980) no. 4, p. 539-603
@article{ASNSP_1980_4_7_4_539_0,
     author = {Amann, Herbert and Zehnder, E.},
     title = {Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 7},
     number = {4},
     year = {1980},
     pages = {539-603},
     zbl = {0452.47077},
     mrnumber = {600524},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1980_4_7_4_539_0}
}
Amann, H.; Zehnder, E. Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 7 (1980) no. 4, pp. 539-603. http://www.numdam.org/item/ASNSP_1980_4_7_4_539_0/

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