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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 8, pp. 1070–1076, August, 1989.
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Kushpel', A.K. Estimates of the diameters of convolution classes in the spaces C and L. Ukr Math J 41, 919–924 (1989). https://doi.org/10.1007/BF01058308
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DOI: https://doi.org/10.1007/BF01058308