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Translated from Matematicheskie Zametki, Vol. 48, No. 3, pp. 20–31, September, 1990.
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Bryuno, A.D. System, similar to a normal form. Mathematical Notes of the Academy of Sciences of the USSR 48, 885–893 (1990). https://doi.org/10.1007/BF01157429
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DOI: https://doi.org/10.1007/BF01157429