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@article{MZM_1980_27_4_a15, author = {K. I. Oskolkov}, title = {Approximate properties of classes of periodic functions}, journal = {Matemati\v{c}eskie zametki}, pages = {651--666}, publisher = {mathdoc}, volume = {27}, number = {4}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_4_a15/} }
K. I. Oskolkov. Approximate properties of classes of periodic functions. Matematičeskie zametki, Tome 27 (1980) no. 4, pp. 651-666. http://geodesic.mathdoc.fr/item/MZM_1980_27_4_a15/