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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 12, pp.1624–1630, December, 1989.
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Ganzburg, M.I. Best approximation of sums of elements and a theorem of Newman and Shapiro. Ukr Math J 41, 1395–1401 (1989). https://doi.org/10.1007/BF01056106
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DOI: https://doi.org/10.1007/BF01056106