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Translated from Problemy Matematicheskogo Analiza, No. 38, December 2008, pp. 23–36.
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Dodonov, N.Y., Zhuk, V.V. On approximation of functions in the spaces \(L_p \left( {\mathbb{R}^2 } \right)\) and \(L_p \left( {\mathbb{R}_{ + }^2 } \right)\) by generalized singular integrals with positive kernels. J Math Sci 156, 589–605 (2009). https://doi.org/10.1007/s10958-009-9276-7
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DOI: https://doi.org/10.1007/s10958-009-9276-7