Voir la notice de l'article provenant de la source Math-Net.Ru
@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}, publisher = {mathdoc}, number = {2}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1981_2_a10/} }
V. N. Spevakov. Absolute summability of orthogonal series by methods~$(E,q)$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1981), pp. 70-73. http://geodesic.mathdoc.fr/item/IVM_1981_2_a10/