@article{1183505540,
author = {Bellman, Richard},
title = {Lambert summability of orthogonal series},
journal = {Bull. Amer. Math. Soc.},
volume = {49},
number = {12},
year = {1943},
pages = { 932-934},
language = {en},
url = {http://dml.mathdoc.fr/item/1183505540}
}
Bellman, Richard. Lambert summability of orthogonal series. Bull. Amer. Math. Soc., Tome 49 (1943) no. 12, pp. 932-934. http://gdmltest.u-ga.fr/item/1183505540/