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@article{GMJ_1994__1_3_47128, author = {Bareladze, G.}, title = {On convergence subsystems of orthonormal systems.}, journal = {Georgian Mathematical Journal}, pages = {235--242}, publisher = {mathdoc}, volume = {1}, number = {3}, year = {1994}, zbl = {0811.42009}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_1994__1_3_47128/} }
Bareladze, G. On convergence subsystems of orthonormal systems.. Georgian Mathematical Journal, Tome 1 (1994) no. 3, pp. 235-242. http://geodesic.mathdoc.fr/item/GMJ_1994__1_3_47128/