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@article{MZM_1990_47_5_a22, author = {V. N. Temlyakov}, title = {On estimates for the widths of classes of infinitely differentiable functions}, journal = {Matemati\v{c}eskie zametki}, pages = {155--157}, publisher = {mathdoc}, volume = {47}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a22/} }
V. N. Temlyakov. On estimates for the widths of classes of infinitely differentiable functions. Matematičeskie zametki, Tome 47 (1990) no. 5, pp. 155-157. http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a22/