@article{MZM_2012_92_4_a1,
     author = {S. B. Vakarchuk and V. I. Zabutnaya},
     title = {Jackson--Stechkin {Type} {Inequalities} for {Special} {Moduli} of {Continuity} and {Widths} of {Function} {Classes} in the {Space~}$L_2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {497--514},
     publisher = {mathdoc},
     volume = {92},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2012_92_4_a1/}
}