@article{GDZPPN002170116,
title = {Elementary theorems concerning power series with positive coefficients and moment constants of positive functions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {156},
year = {1927},
pages = {141-158},
zbl = {53.0193.03},
url = {http://dml.mathdoc.fr/item/GDZPPN002170116}
}
Hardy, G.H.; Littlewood, J.E. Elementary theorems concerning power series with positive coefficients and moment constants of positive functions.. Journal für die reine und angewandte Mathematik, Tome 156 (1927) pp. 141-158. http://gdmltest.u-ga.fr/item/GDZPPN002170116/