Exact values of widths of classes of functions in $L_2$
Doklady Akademii Nauk, Tome 344 (1995) no. 5, pp. 583-585.

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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/}
}
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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/