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Translated from Matematicheskie Zametki, Vol. 20, No. 5, pp. 775–780, November, 1976.
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Bausov, L.I., Petrov, I.M. Approximation of a class of functions of several variables by certain polynomial operators. Mathematical Notes of the Academy of Sciences of the USSR 20, 992–995 (1976). https://doi.org/10.1007/BF01146927
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DOI: https://doi.org/10.1007/BF01146927