@article{CHEB_2019_20_4_a24,
     author = {M. Sh. Shabozov},
     title = {Some problems of approximation of periodic functions by trigonometric polynomials in $L_2$},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {385--398},
     year = {2019},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2019_20_4_a24/}
}