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Translated from Ukrainskii Matematicheskii Zhurnal, Vol 38, No. 1, pp. 75–78, January–February, 1986.
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Belitskii, G.R. Finite-definiteness of formal mappings. Ukr Math J 38, 66–68 (1986). https://doi.org/10.1007/BF01056760
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DOI: https://doi.org/10.1007/BF01056760