%0 Journal Article %A Lee, Cheng %T Infinitely many homoclinic orbits for Hamiltonian systems with group symmetries %J Electronic Journal of Differential Equations %D 1999 %V 1999 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a64/ %G en %F EJDE_1999__1999__a64