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    Optimal quadrature problem on n-information for Hardy-Sobolev classes

    For β > 0 and an integer r ≥ 2, denote by \(\tilde H_{\infty ,\beta }^r\) those 2π-periodic, real-valued functions f ...

    Xue Hua Li, Gen Sun Fang in Acta Mathematica Sinica, English Series (2011)