@article{00806192, title = {On the convergence and summability of series with respect to block-orthonormal systems.}, journal = {Georgian Mathematical Journal}, volume = {2}, year = {1995}, pages = {517-534}, doi = {10.1007/BF02259671}, zbl = {0947.42020}, language = {en}, url = {http://dml.mathdoc.fr/item/00806192} }
Nadibaidze, G. On the convergence and summability of series with respect to block-orthonormal systems.. Georgian Mathematical Journal, Tome 2 (1995) pp. 517-534. doi : 10.1007/BF02259671. http://gdmltest.u-ga.fr/item/00806192/