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@article{MZM_1986_39_3_a7, author = {N. A. Il'yasov}, title = {Approximation of periodic functions by {Zygmund} means}, journal = {Matemati\v{c}eskie zametki}, pages = {367--382}, publisher = {mathdoc}, volume = {39}, number = {3}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_3_a7/} }
N. A. Il'yasov. Approximation of periodic functions by Zygmund means. Matematičeskie zametki, Tome 39 (1986) no. 3, pp. 367-382. http://geodesic.mathdoc.fr/item/MZM_1986_39_3_a7/