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@article{DAN_1987_293_4_a5, author = {A. I. Stepanets}, title = {Approximations on classes of $(\psi,\beta)$-differentiable functions}, journal = {Doklady Akademii Nauk}, pages = {797--800}, publisher = {mathdoc}, volume = {293}, number = {4}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_4_a5/} }
A. I. Stepanets. Approximations on classes of $(\psi,\beta)$-differentiable functions. Doklady Akademii Nauk, Tome 293 (1987) no. 4, pp. 797-800. http://geodesic.mathdoc.fr/item/DAN_1987_293_4_a5/