Some inequalities between best approximations and moduli of continuity in an $L_2$ space
Matematičeskie zametki, Tome 24 (1978) no. 6, pp. 785-792.

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@article{MZM_1978_24_6_a6,
     author = {A. A. Ligun},
     title = {Some inequalities between best approximations and moduli of continuity in an $L_2$ space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {785--792},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_6_a6/}
}
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A. A. Ligun. Some inequalities between best approximations and moduli of continuity in an $L_2$ space. Matematičeskie zametki, Tome 24 (1978) no. 6, pp. 785-792. http://geodesic.mathdoc.fr/item/MZM_1978_24_6_a6/