Geodesic
Norms of trigonometrical polynomials and approximation of differentiable functions by averages of their Fourier series.~I
Informatics and Automation, Collection of articles on linear methods of summation of Fourier series, Tome 62 (1961), pp. 61-97.

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     author = {S. A. Telyakovskii},
     title = {Norms of trigonometrical polynomials and approximation of differentiable functions by averages of their {Fourier} {series.~I}},
     journal = {Informatics and Automation},
     pages = {61--97},
     publisher = {mathdoc},
     volume = {62},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1961_62_a2/}
}
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S. A. Telyakovskii. Norms of trigonometrical polynomials and approximation of differentiable functions by averages of their Fourier series.~I. Informatics and Automation, Collection of articles on linear methods of summation of Fourier series, Tome 62 (1961), pp. 61-97. http://geodesic.mathdoc.fr/item/TRSPY_1961_62_a2/