%0 Journal Article %A Viktor L. Ginzburg %T On the existence and non-existence of closed trajectories for some Hamiltonian flows. %J Mathematische Zeitschrift %D 1996 %P 397-410 %V 223 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174927/ %F MZ_1996__223_3_174927