@article{DAN_1979_244_1_a3,
     author = {O. A. Ziza},
     title = {On the application of summability methods of class $(\varphi,\lambda)$ to orthogonal series},
     journal = {Doklady Akademii Nauk},
     pages = {24--28},
     publisher = {mathdoc},
     volume = {244},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_244_1_a3/}
}