MathSciNet bibliographic data MR217487 41.15 (46.00) Birman, M. Š.; Solomjak, M. Z. Piecewise polynomial approximations of functions of classes $W\sb{p}{}\sp{\alpha }$$W\sb{p}{}\sp{\alpha }$. (Russian) Mat. Sb. (N.S.) 73 (115) 1967 331–355. Links to the journal or article are not yet available

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