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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 38, No. 4, pp. 437–443, July–August, 1986.
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Kovtunets, V.V. Differential properties of the best-approximation operator for complex-valued functions. I. Ukr Math J 38, 371–375 (1986). https://doi.org/10.1007/BF01057293
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DOI: https://doi.org/10.1007/BF01057293