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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 6, pp. 1283–1291, November–December, 1971.
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Zhuk, V.V. Some sharp inequalities between best approximations and moduli of continuity. Sib Math J 12, 924–930 (1971). https://doi.org/10.1007/BF00966535
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DOI: https://doi.org/10.1007/BF00966535