@article{DAN_1974_217_3_a0,
     author = {Ya. S. Bugrov},
     title = {On the regularity of linear summability methods for {Fourier} series},
     journal = {Doklady Akademii Nauk},
     pages = {505--507},
     publisher = {mathdoc},
     volume = {217},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_217_3_a0/}
}