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@article{DAN_1995_344_5_a0, author = {G. G. Magaril-Il'yaev and V. M. Tikhomirov}, title = {Exact values of widths of classes of functions in $L_2$}, journal = {Doklady Akademii Nauk}, pages = {583--585}, publisher = {mathdoc}, volume = {344}, number = {5}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1995_344_5_a0/} }
G. G. Magaril-Il'yaev; V. M. Tikhomirov. Exact values of widths of classes of functions in $L_2$. Doklady Akademii Nauk, Tome 344 (1995) no. 5, pp. 583-585. http://geodesic.mathdoc.fr/item/DAN_1995_344_5_a0/