Geodesic
Exact values of relative widths of classes of differentiable functions
Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 871-879 
Yu. N. Subbotin; S. A. Telyakovskii. Exact values of relative widths of classes of differentiable functions. Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 871-879. http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a8/
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     title = {Exact values of relative widths of classes of differentiable functions},
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     volume = {65},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a8/}
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