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Additional information
Petrochemical and Gas Industry Institute, Moscow. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 4, pp. 180–193, July–August, 1980.
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Nikol'skaya, N.S. More about the approximation of periodic functions of the classes\(SH\begin{array}{*{20}c} r \\ * \\ p \\ \end{array}\) by fourier sums. Sib Math J 21, 617–627 (1980). https://doi.org/10.1007/BF00995966
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DOI: https://doi.org/10.1007/BF00995966