@article{SM_2021_212_2_a4,
     author = {K. V. Runovskii},
     title = {Multiplicator type operators and approximation of periodic functions of one variable by trigonometric polynomials},
     journal = {Sbornik. Mathematics},
     pages = {234--264},
     publisher = {mathdoc},
     volume = {212},
     number = {2},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2021_212_2_a4/}
}