@article{TIMM_2016_22_4_a14,
     author = {N. A. Il'yasov},
     title = {The inverse theorem in various metrics of approximation theory for periodic functions with monotone {Fourier} coefficients},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {153--162},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2016_22_4_a14/}
}