@article{MAN_1970__188_162054,
     author = {F. TAKENS},
     title = {Hamiltonian {Systems:} {Generic} {Properties} of {Closed} {Orbits} and {Local} {Perturbations.}},
     journal = {Mathematische Annalen},
     pages = {304--312},
     publisher = {mathdoc},
     volume = {188},
     year = {1970},
     zbl = {0191.21602},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__188_162054/}
}