TY  - JOUR
AU  - Bartsch, Thomas
TI  - A generalization of the Weinstein-Moser theorems on periodic orbits of a hamiltonian system near an equilibrium
JO  - Annales de l'I.H.P. Analyse non linéaire
PY  - 1997
SP  - 691
EP  - 718
VL  - 14
IS  - 6
PB  - Gauthier-Villars
UR  - http://archive.numdam.org/item/AIHPC_1997__14_6_691_0/
LA  - en
ID  - AIHPC_1997__14_6_691_0
ER  -