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This paper has been supported by the Committee for Academic Schools of the Russian Federation (grant no. 2-13-0-20).
Translated from Matematicheskie Zametki, Vol. 55, No. 5, pp. 88–97, May, 1994.
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Lerman, L.M., Umanskii, Y.L. Isoenergetic classification of integrable Hamiltonian systems in a neighborhood of a simple elliptic point. Math Notes 55, 496–501 (1994). https://doi.org/10.1007/BF02110377
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DOI: https://doi.org/10.1007/BF02110377