@article{MZM_1999_65_6_a8,
     author = {Yu. N. Subbotin and S. A. Telyakovskii},
     title = {Exact values of relative widths of classes of differentiable functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {871--879},
     publisher = {mathdoc},
     volume = {65},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a8/}
}