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@article{DAN_1958_119_3_a3, author = {A. G. Vitushkin}, title = {The closest approximations of differentiable and analytic functions}, journal = {Doklady Akademii Nauk}, pages = {418--420}, publisher = {mathdoc}, volume = {119}, number = {3}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_3_a3/} }
A. G. Vitushkin. The closest approximations of differentiable and analytic functions. Doklady Akademii Nauk, Tome 119 (1958) no. 3, pp. 418-420. http://geodesic.mathdoc.fr/item/DAN_1958_119_3_a3/