@article{TIMM_2017_23_3_a12,
     author = {N. A. Il'yasov},
     title = {The direct theorem of the theory of approximation of periodic functions with monotone {Fourier} coefficients in different metrics},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {144--158},
     year = {2017},
     volume = {23},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2017_23_3_a12/}
}