@article{1077476006,
author = {Bellman, Richard},
title = {Ramanujan sums and the average value of arithmetic functions},
journal = {Duke Math. J.},
volume = {17},
number = {1},
year = {1950},
pages = { 159-168},
language = {en},
url = {http://dml.mathdoc.fr/item/1077476006}
}
Bellman, Richard. Ramanujan sums and the average value of arithmetic functions. Duke Math. J., Tome 17 (1950) no. 1, pp. 159-168. http://gdmltest.u-ga.fr/item/1077476006/