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Deceased.
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 3, pp. 344–348, May–June, 1985.
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Bardzinskii, V.V. Strong local theorems for approximation of periodic functions of many variables. Ukr Math J 37, 269–273 (1985). https://doi.org/10.1007/BF01059607
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DOI: https://doi.org/10.1007/BF01059607