%0 Journal Article
%A Horozov, Emil Ivanov
%A Iliev, Iliya Dimov
%T Perturbations of quadratic hamiltonian systems with symmetry
%J Annales de l'I.H.P. Analyse non linéaire
%D 1996
%P 17-56
%V 13
%N 1
%I Gauthier-Villars
%U http://archive.numdam.org/item/AIHPC_1996__13_1_17_0/
%G en
%F AIHPC_1996__13_1_17_0