@article{AIHPC_1994__11_6_613_0,
     author = {Ambrosetti, Antonio and Tanaka, Kazunaga and Vitillaro, Enzo},
     title = {Periodic solutions with prescribed energy for some keplerian $N$-body problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {613--632},
     publisher = {Gauthier-Villars},
     volume = {11},
     number = {6},
     year = {1994},
     mrnumber = {1310624},
     zbl = {0855.70006},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1994__11_6_613_0/}
}