Geodesic
An estimate of the norm of a function by its Fourier coefficients that is suitable in problems of approximation theory
Informatics and Automation, Приближение периодических функций, Tome 109 (1971), pp. 65-97.

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     author = {S. A. Telyakovskii},
     title = {An estimate of the norm of a function by its {Fourier} coefficients that is suitable in problems of approximation theory},
     journal = {Informatics and Automation},
     pages = {65--97},
     publisher = {mathdoc},
     volume = {109},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a5/}
}
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S. A. Telyakovskii. An estimate of the norm of a function by its Fourier coefficients that is suitable in problems of approximation theory. Informatics and Automation, Приближение периодических функций, Tome 109 (1971), pp. 65-97. http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a5/