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Translated from Sovremennaya Matematika. Fundamental’nye Napravleniya (Contemporary Mathematics. Fundamental Directions), Vol. 50, Functional Analysis, 2013.
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Irodova, I.P. Piecewise Polynomial Approximation Methods in the Theory of Nikol’Skiĭ–Besov Spaces. J Math Sci 209, 319–480 (2015). https://doi.org/10.1007/s10958-015-2506-2
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DOI: https://doi.org/10.1007/s10958-015-2506-2