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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 3, pp. 341–344, May–June, 1982.
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Andrienko, V.A., G"rnevska, L.V. Speed of approximation of functions by convergence systems. Ukr Math J 34, 278–280 (1982). https://doi.org/10.1007/BF01682118
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DOI: https://doi.org/10.1007/BF01682118