Geodesic
On the best approximation of classes of functions representable in the convolution form
Doklady Akademii Nauk, Tome 118 (1958) no. 2, pp. 247-250 
Sun Yong-sheng. On the best approximation of classes of functions representable in the convolution form. Doklady Akademii Nauk, Tome 118 (1958) no. 2, pp. 247-250. http://geodesic.mathdoc.fr/item/DAN_1958_118_2_a10/
@article{DAN_1958_118_2_a10,
     author = {Sun Yong-sheng},
     title = {On the best approximation of classes of functions representable in the convolution form},
     journal = {Doklady Akademii Nauk},
     pages = {247--250},
     year = {1958},
     volume = {118},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_2_a10/}
}
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