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@article{MAN_1992__292_2_164932, author = {Misha Bialy and Leonid Polterovich}, title = {Hamiltonian systems, {Lagrangian} tori and {Birkhoffs's} theorem.}, journal = {Mathematische Annalen}, pages = {619--628}, publisher = {mathdoc}, volume = {292}, number = {2}, year = {1992}, zbl = {0735.58016}, url = {http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164932/} }
Misha Bialy; Leonid Polterovich. Hamiltonian systems, Lagrangian tori and Birkhoffs's theorem.. Mathematische Annalen, Tome 292 (1992) no. 2, pp. 619-628. http://geodesic.mathdoc.fr/item/MAN_1992__292_2_164932/