Geodesic
The best approximations in $L_2(0,2\pi)$ of classes of periodic functions with derivatives of bounded variation
Matematičeskie zametki, Tome 28 (1980) no. 2, pp. 239-242.

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     author = {L. V. Taikov},
     title = {The best approximations in $L_2(0,2\pi)$ of classes of periodic functions with derivatives of bounded variation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {239--242},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_2_a4/}
}
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L. V. Taikov. The best approximations in $L_2(0,2\pi)$ of classes of periodic functions with derivatives of bounded variation. Matematičeskie zametki, Tome 28 (1980) no. 2, pp. 239-242. http://geodesic.mathdoc.fr/item/MZM_1980_28_2_a4/