@article{MZM_2018_103_4_a13,
     author = {M. Sh. Shabozov and M. S. Saidusajnov},
     title = {Upper {Bounds} for the {Approximation} of {Certain} {Classes} of {Functions} of a {Complex} {Variable} by {Fourier} {Series} in the {Space~}$L_2$ and $n${-Widths}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {617--631},
     publisher = {mathdoc},
     volume = {103},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_103_4_a13/}
}