no. 2
Homoclinics : Poincaré-Melnikov type results via a variational approach
Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 2, pp. 233-252 
@article{AIHPC_1998__15_2_233_0,
     author = {Ambrosetti, Antonio and Badiale, Marino},
     title = {Homoclinics : {Poincar\'e-Melnikov} type results via a variational approach},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {233--252},
     year = {1998},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {2},
     mrnumber = {1614571},
     zbl = {1004.37043},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1998__15_2_233_0/}
}
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Ambrosetti, Antonio; Badiale, Marino. Homoclinics : Poincaré-Melnikov type results via a variational approach. Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 2, pp. 233-252. https://www.numdam.org/item/AIHPC_1998__15_2_233_0/

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