Geodesic
The sharpness of the Lebesgue estimate for the approximation of functions with prescribed modulus of continuity by Fourier sums
Informatics and Automation, Collection of articles. Part I, Tome 112 (1971), pp. 337-345.

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@article{TRSPY_1971_112_a21,
     author = {K. I. Oskolkov},
     title = {The sharpness of the {Lebesgue} estimate for the approximation of functions with prescribed modulus of continuity by {Fourier} sums},
     journal = {Informatics and Automation},
     pages = {337--345},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a21/}
}
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K. I. Oskolkov. The sharpness of the Lebesgue estimate for the approximation of functions with prescribed modulus of continuity by Fourier sums. Informatics and Automation, Collection of articles. Part I, Tome 112 (1971), pp. 337-345. http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a21/