@article{IVM_1981_2_a10,
     author = {V. N. Spevakov},
     title = {Absolute summability of orthogonal series by methods~$(E,q)$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {70--73},
     year = {1981},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_2_a10/}
}