Geodesic
Isoenergetic classification of integrable Hamiltonian systems in a neighborhood of a simple elliptic point
Matematičeskie zametki, Tome 55 (1994) no. 5, pp. 88-97.

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     title = {Isoenergetic classification of integrable {Hamiltonian} systems in a neighborhood of a simple elliptic point},
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L. M. Lerman; Ya. L. Umanskii. Isoenergetic classification of integrable Hamiltonian systems in a neighborhood of a simple elliptic point. Matematičeskie zametki, Tome 55 (1994) no. 5, pp. 88-97. http://geodesic.mathdoc.fr/item/MZM_1994_55_5_a8/

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