%0 Journal Article %A Ambrosetti, Antonio %A Tanaka, Kazunaga %A Vitillaro, Enzo %T Periodic solutions with prescribed energy for some keplerian $N$-body problems %J Annales de l'I.H.P. Analyse non linéaire %D 1994 %P 613-632 %V 11 %N 6 %I Gauthier-Villars %G en %F AIHPC_1994__11_6_613_0