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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 2, pp. 154–160, March–April, 1984.
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Konovalov, V.N. Approximation of functions of several variables by polynomials with preservation of the differential-difference properties. Ukr Math J 36, 138–143 (1984). https://doi.org/10.1007/BF01066944
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DOI: https://doi.org/10.1007/BF01066944