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Translated from Matematicheskie Zametki, Vol. 33, No. 3, pp. 333–344, March, 1983.
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Bryuno, A.D. Noncanonical invariants of Hamiltonian systems. Mathematical Notes of the Academy of Sciences of the USSR 33, 167–174 (1983). https://doi.org/10.1007/BF01686322
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DOI: https://doi.org/10.1007/BF01686322