MathSciNet bibliographic data MR2031737 41A10 (30E10 41A25) Motornyĭ, V. P. On sharp estimates for the pointwise approximation of the classes $W^rH^\omega$$W^rH^\omega$ by algebraic polynomials. (Russian) Ukraïn. Mat. Zh. 53 (2001), no. 6, 783--799; translation in Ukrainian Math. J. 53 (2001), no. 6, 916–937 Article

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