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@article{DAN_1963_152_1_a6, author = {A. V. Efimov}, title = {On nonsummability of orthogonal series by linear methods}, journal = {Doklady Akademii Nauk}, pages = {31--34}, publisher = {mathdoc}, volume = {152}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_1_a6/} }
A. V. Efimov. On nonsummability of orthogonal series by linear methods. Doklady Akademii Nauk, Tome 152 (1963) no. 1, pp. 31-34. http://geodesic.mathdoc.fr/item/DAN_1963_152_1_a6/