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Translated from Matematicheskie Zametki, Vol. 31, No. 3, pp. 403–410, March, 1982.
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Bryuno, A.D. Divergence of a real normalizing transformation. Mathematical Notes of the Academy of Sciences of the USSR 31, 207–211 (1982). https://doi.org/10.1007/BF01145469
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DOI: https://doi.org/10.1007/BF01145469