@article{1077492650,
author = {Forsythe, G. E.},
title = {Riesz summability methods of order $r$ , for $\mathcal{R}(r)<0$},
journal = {Duke Math. J.},
volume = {8},
number = {1},
year = {1941},
pages = { 346-349},
language = {en},
url = {http://dml.mathdoc.fr/item/1077492650}
}
Forsythe, G. E. Riesz summability methods of order $r$ , for $\mathcal{R}(r)<0$. Duke Math. J., Tome 8 (1941) no. 1, pp. 346-349. http://gdmltest.u-ga.fr/item/1077492650/