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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 35, No. 4, pp. 409–415, July–August, 1983.
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Avakyan, A.M. Approximation of functions of two variables by linear methods. Ukr Math J 35, 351–356 (1983). https://doi.org/10.1007/BF01093081
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DOI: https://doi.org/10.1007/BF01093081