@article{GDZPPN002445743,
title = {On the existence and non-existence of closed trajectories for some Hamiltonian flows.},
journal = {Mathematische Zeitschrift},
volume = {221},
year = {1996},
pages = {397-410},
zbl = {0862.58020},
url = {http://dml.mathdoc.fr/item/GDZPPN002445743}
}
Ginzburg, Viktor L. On the existence and non-existence of closed trajectories for some Hamiltonian flows.. Mathematische Zeitschrift, Tome 221 (1996) pp. 397-410. http://gdmltest.u-ga.fr/item/GDZPPN002445743/