%0 Journal Article %A Françoise, J. P. %A Ragnisco, O. %T Matrix second-order differential equations and hamiltonian systems of quartic type %J Annales de l'I.H.P. Physique théorique %D 1989 %P 369-375 %V 50 %N 3 %I Gauthier-Villars %G en %F AIHPA_1989__50_3_369_0