no. 5
Periodic solutions for N-body type problems
Annales de l'I.H.P. Analyse non linéaire, Tome 7 (1990) no. 5, pp. 477-492. 
@article{AIHPC_1990__7_5_477_0,
     author = {Coti Zelati, Vittorio},
     title = {Periodic solutions for {N-body} type problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {477--492},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {5},
     year = {1990},
     mrnumber = {1138534},
     zbl = {0723.70010},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1990__7_5_477_0/}
}
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Coti Zelati, Vittorio. Periodic solutions for N-body type problems. Annales de l'I.H.P. Analyse non linéaire, Tome 7 (1990) no. 5, pp. 477-492. http://archive.numdam.org/item/AIHPC_1990__7_5_477_0/

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