TY  - JOUR
AU  - Benci, V.
TI  - Normal modes of a lagrangian system constrained in a potential well
JO  - Annales de l'I.H.P. Analyse non linéaire
PY  - 1984
SP  - 379
EP  - 400
VL  - 1
IS  - 5
PB  - Gauthier-Villars
UR  - http://archive.numdam.org/item/AIHPC_1984__1_5_379_0/
LA  - en
ID  - AIHPC_1984__1_5_379_0
ER  -