@article{GDZPPN002303612,
title = {Hamiltonian Systems: Generic Properties of Closed Orbits and Local Perturbations.},
journal = {Mathematische Annalen},
volume = {189},
year = {1970},
pages = {304-312},
zbl = {0191.21602},
url = {http://dml.mathdoc.fr/item/GDZPPN002303612}
}
TAKENS, F. Hamiltonian Systems: Generic Properties of Closed Orbits and Local Perturbations.. Mathematische Annalen, Tome 189 (1970) pp. 304-312. http://gdmltest.u-ga.fr/item/GDZPPN002303612/