Homoclinic and periodic orbits for hamiltonian systems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 285-301. 
@article{ASNSP_1998_4_26_2_285_0,
     author = {Felmer, Patricio L. and Silva, Elves A. de B.},
     title = {Homoclinic and periodic orbits for hamiltonian systems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {285--301},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 26},
     number = {2},
     year = {1998},
     mrnumber = {1631585},
     zbl = {0919.58026},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1998_4_26_2_285_0/}
}
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Felmer, Patricio L.; Silva, Elves A. de B. Homoclinic and periodic orbits for hamiltonian systems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 285-301. http://www.numdam.org/item/ASNSP_1998_4_26_2_285_0/

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