@article{MZM_1969_5_6_a13,
     author = {Yu. M. Shmandin},
     title = {Summability of orthogonal series by some linear methods},
     journal = {Matemati\v{c}eskie zametki},
     pages = {753--762},
     publisher = {mathdoc},
     volume = {5},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_6_a13/}
}