%0 Journal Article %A Ciriza, Eleonora %T Bifurcation of periodic orbits of time dependent Hamiltonian systems on symplectic manifolds. %J Rendiconti del seminario matematico %D 1999 %P 161-173 %V 57 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RSM_1999__57_3_125130/ %G en %F RSM_1999__57_3_125130