Geodesic
On the best approximation of Dirichlet kernels
Matematičeskie zametki, Tome 53 (1993) no. 6, pp. 116-121 
L. V. Taikov. On the best approximation of Dirichlet kernels. Matematičeskie zametki, Tome 53 (1993) no. 6, pp. 116-121. http://geodesic.mathdoc.fr/item/MZM_1993_53_6_a12/
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     author = {L. V. Taikov},
     title = {On the best approximation of {Dirichlet} kernels},
     journal = {Matemati\v{c}eskie zametki},
     pages = {116--121},
     year = {1993},
     volume = {53},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_6_a12/}
}
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[1] Taikov L. V., “Odin krug ekstremalnykh zadach dlya trigonometricheskikh polinomov”, UMN, 20:3 (123) (1965), 205–211 | MR | Zbl