TY  - JOUR
AU  - Ambrosetti, A.
AU  - Coti-Zelati, V.
TI  - Closed orbits of fixed energy for a class of N-body problems
JO  - Annales de l'I.H.P. Analyse non linéaire
PY  - 1992
SP  - 187
EP  - 200
VL  - 9
IS  - 2
PB  - Gauthier-Villars
UR  - http://www.numdam.org/item/AIHPC_1992__9_2_187_0/
LA  - en
ID  - AIHPC_1992__9_2_187_0
ER  -