@article{01278753,
title = {On the absolute summability of series with respect to block-orthonormal systems.},
journal = {Georgian Mathematical Journal},
volume = {6},
year = {1999},
pages = {83-90},
doi = {10.1023/A:1022982527065},
zbl = {0920.42023},
language = {en},
url = {http://dml.mathdoc.fr/item/01278753}
}
Nadibaidze, G. On the absolute summability of series with respect to block-orthonormal systems.. Georgian Mathematical Journal, Tome 6 (1999) pp. 83-90. doi : 10.1023/A:1022982527065. http://gdmltest.u-ga.fr/item/01278753/