@article{AIHPC_1997__14_6_691_0, author = {Bartsch, Thomas}, title = {A generalization of the Weinstein-Moser theorems on periodic orbits of a hamiltonian system near an equilibrium}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {14}, year = {1997}, pages = {691-718}, mrnumber = {1482899}, zbl = {0891.58034}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1997__14_6_691_0} }
Bartsch, Thomas. A generalization of the Weinstein-Moser theorems on periodic orbits of a hamiltonian system near an equilibrium. Annales de l'I.H.P. Analyse non linéaire, Tome 14 (1997) pp. 691-718. http://gdmltest.u-ga.fr/item/AIHPC_1997__14_6_691_0/
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