%0 Journal Article
%A Benci, V.
%T Normal modes of a lagrangian system constrained in a potential well
%J Annales de l'I.H.P. Analyse non linéaire
%D 1984
%P 379-400
%V 1
%N 5
%I Gauthier-Villars
%U http://www.numdam.org/item/AIHPC_1984__1_5_379_0/
%G en
%F AIHPC_1984__1_5_379_0