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@article{DAN_1957_113_6_a2, author = {Yu. A. Kaz'min}, title = {On complete systems and bases in $L_2$}, journal = {Doklady Akademii Nauk}, pages = {1199--1202}, publisher = {mathdoc}, volume = {113}, number = {6}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a2/} }
Yu. A. Kaz'min. On complete systems and bases in $L_2$. Doklady Akademii Nauk, Tome 113 (1957) no. 6, pp. 1199-1202. http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a2/