Geodesic
The sharpness of the Lebesgue estimate for the approximation of functions with prescribed modulus of continuity by Fourier sums
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Collection of articles. Part I, Tome 112 (1971), pp. 337-345.

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     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 = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {337--345},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_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. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Collection of articles. Part I, Tome 112 (1971), pp. 337-345. http://geodesic.mathdoc.fr/item/TM_1971_112_a21/