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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 4, pp. 467–473, July–August, 1984.
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Parasyuk, I.O. Conservation of multidimensional invariant tori of Hamiltonian systems. Ukr Math J 36, 380–385 (1984). https://doi.org/10.1007/BF01066558
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DOI: https://doi.org/10.1007/BF01066558