@article{GDZPPN00220455X,
title = {A quantitative version of Hurwitz' theorem on the arithmetic-geometric inequality.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {374},
year = {1987},
pages = {108-112},
zbl = {0615.10028},
url = {http://dml.mathdoc.fr/item/GDZPPN00220455X}
}
Reznick, Bruce. A quantitative version of Hurwitz' theorem on the arithmetic-geometric inequality.. Journal für die reine und angewandte Mathematik, Tome 374 (1987) pp. 108-112. http://gdmltest.u-ga.fr/item/GDZPPN00220455X/