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@article{MZM_1974_15_5_a16, author = {V. I. Berdyshev}, title = {On the modulus of continuity of an operator of best approximation}, journal = {Matemati\v{c}eskie zametki}, pages = {797--808}, publisher = {mathdoc}, volume = {15}, number = {5}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a16/} }
V. I. Berdyshev. On the modulus of continuity of an operator of best approximation. Matematičeskie zametki, Tome 15 (1974) no. 5, pp. 797-808. http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a16/