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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 3, pp. 727–728, May–June, 1968.
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Kuz'min, E.N. On an estimate in the theory of normed rings. Sib Math J 9, 544 (1968). https://doi.org/10.1007/BF01040922
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DOI: https://doi.org/10.1007/BF01040922