no. 3
Non-collision orbits for a class of keplerian-like potentials
Annales de l'I.H.P. Analyse non linéaire, Tome 5 (1988) no. 3, pp. 287-295. 
@article{AIHPC_1988__5_3_287_0,
     author = {Ambrosetti, Antonio and Coti Zelati, Vittorio},
     title = {Non-collision orbits for a class of keplerian-like potentials},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {287--295},
     publisher = {Gauthier-Villars},
     volume = {5},
     number = {3},
     year = {1988},
     mrnumber = {954474},
     zbl = {0667.58055},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1988__5_3_287_0/}
}
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Ambrosetti, Antonio; Coti Zelati, Vittorio. Non-collision orbits for a class of keplerian-like potentials. Annales de l'I.H.P. Analyse non linéaire, Tome 5 (1988) no. 3, pp. 287-295. http://www.numdam.org/item/AIHPC_1988__5_3_287_0/

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