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Additional information
Low-Temperature Institute of Physical Engineering, Academy of Sciences of the Ukrainian SSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 13, No. 1, pp. 59–60, January–March, 1978.
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Belitskii, G.R. Invariant normal forms of formal series. Funct Anal Its Appl 13, 46–47 (1979). https://doi.org/10.1007/BF01076439
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DOI: https://doi.org/10.1007/BF01076439