@article{MZM_2015_98_4_a2,
     author = {S. B. Vakarchuk},
     title = {Generalized {Smoothness} {Characteristics} in {Jackson-Type} {Inequalities} and {Widths} of {Classes} of {Functions} in~$L_2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {511--529},
     publisher = {mathdoc},
     volume = {98},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2015_98_4_a2/}
}