@article{DAN_1988_303_1_a10,
     author = {A. I. Stepanets},
     title = {Approximation by {Fourier} operators of functions that are defined},
     journal = {Doklady Akademii Nauk},
     pages = {50--53},
     publisher = {mathdoc},
     volume = {303},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_303_1_a10/}
}