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Translated from Matematicheskie Zametki, Vol. 53, No. 1, pp. 3–15, January, 1993.
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Vasil'ev, R.K. On the degree of the approximation of functions of several variables by linear positive operators of finite rank. Math Notes 53, 3–11 (1993). https://doi.org/10.1007/BF01208516
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DOI: https://doi.org/10.1007/BF01208516