@article{MZM_2016_99_2_a5,
     author = {S. B. Vakarchuk and V. I. Zabutnaya},
     title = {Inequalities between {Best} {Polynomial} {Approximations} and {Some} {Smoothness} {Characteristics} in the {Space~}$L_2$ and {Widths} of {Classes} of {Functions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {215--238},
     publisher = {mathdoc},
     volume = {99},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_99_2_a5/}
}