Geodesic
Approximations of periodic functions by trigonometrical polynomials
Informatics and Automation, Approximations of periodic functions by trigonometrical polynomials, Tome 15 (1945), pp. 3-76.

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     author = {S. M. Nikol'skii},
     title = {Approximations of periodic functions by trigonometrical polynomials},
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     volume = {15},
     year = {1945},
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     url = {http://geodesic.mathdoc.fr/item/TRSPY_1945_15_a0/}
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S. M. Nikol'skii. Approximations of periodic functions by trigonometrical polynomials. Informatics and Automation, Approximations of periodic functions by trigonometrical polynomials, Tome 15 (1945), pp. 3-76. http://geodesic.mathdoc.fr/item/TRSPY_1945_15_a0/