%0 Journal Article %A Féthi Grabsi %A James Montaldi %A Juan-Pablo Ortega %T Bifurcation and forced symmetry breaking in Hamiltonian systems %J Comptes Rendus. Mathématique %D 2004 %P 565-570 %V 338 %N 7 %I Elsevier %R 10.1016/j.crma.2004.01.029 %G en %F CRMATH_2004__338_7_565_0