Conservation of multidimensional invariant tori of Hamiltonian systems
English version (Springer): Ukrainian Mathematical Journal 36 (1984), no. 4, pp 380-385.
Citation Example: Parasyuk I. O. Conservation of multidimensional invariant tori of Hamiltonian systems // Ukr. Mat. Zh. - 1984. - 36, № 4. - pp. 467 – 473.
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