no. 1
Multiple homoclinic solutions for a class of autonomous singular systems in ℝ 2
Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 1, pp. 113-125. 
@article{AIHPC_1998__15_1_113_0,
     author = {Caldiroli, Paolo and Nolasco, Margherita},
     title = {Multiple homoclinic solutions for a class of autonomous singular systems in $\mathbb R^2$},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {113--125},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {1},
     year = {1998},
     mrnumber = {1614603},
     zbl = {0907.58014},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1998__15_1_113_0/}
}
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Caldiroli, Paolo; Nolasco, Margherita. Multiple homoclinic solutions for a class of autonomous singular systems in $\mathbb R^2$. Annales de l'I.H.P. Analyse non linéaire, Tome 15 (1998) no. 1, pp. 113-125. http://archive.numdam.org/item/AIHPC_1998__15_1_113_0/

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