Geodesic
Exact estimates of approximation of periodic functions by linear polynomial methods of convolution type
Matematičeskie zametki, Tome 33 (1983) no. 2, pp. 227-234 
V. V. Shalaev. Exact estimates of approximation of periodic functions by linear polynomial methods of convolution type. Matematičeskie zametki, Tome 33 (1983) no. 2, pp. 227-234. http://geodesic.mathdoc.fr/item/MZM_1983_33_2_a7/
@article{MZM_1983_33_2_a7,
     author = {V. V. Shalaev},
     title = {Exact estimates of approximation of periodic functions by linear polynomial methods of convolution type},
     journal = {Matemati\v{c}eskie zametki},
     pages = {227--234},
     year = {1983},
     volume = {33},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_2_a7/}
}
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