Approximation of functions of several variables by polynomials with preservation of the differential-difference properties
English version (Springer): Ukrainian Mathematical Journal 36 (1984), no. 2, pp 138-143.
Citation Example: Konovalov V. N. Approximation of functions of several variables by polynomials with preservation of the differential-difference properties // Ukr. Mat. Zh. - 1984. - 36, № 2. - pp. 154 - 160.
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