@article{MZM_2002_71_4_a3,
     author = {S. B. Vakarchuk},
     title = {$K${-Functionals} and {Exact} {Values} of {n-Widths} of {Certain} {Classes} in the {Spaces} $C(2\pi )$ and $L_1(2\pi )$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {522--531},
     publisher = {mathdoc},
     volume = {71},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2002_71_4_a3/}
}