@article{MZM_2009_86_3_a14,
     author = {Yu. N. Subbotin and S. A. Telyakovskii},
     title = {On the {Equality} of {Kolmogorov} and {Relative} {Widths} of {Classes} of {Differentiable} {Functions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {456--465},
     publisher = {mathdoc},
     volume = {86},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_3_a14/}
}