@article{DAN_1989_306_2_a8,
     author = {R. M. Trigub},
     title = {Multipliers of {Fourier} series and approximation of functions by},
     journal = {Doklady Akademii Nauk},
     pages = {292--296},
     publisher = {mathdoc},
     volume = {306},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_2_a8/}
}