@article{GDZPPN002480425,
title = {Density Functions for Prime and Relatively Prime Numbers.},
journal = {Monatshefte f\"ur Mathematik},
volume = {84},
year = {1977},
pages = {99-112},
zbl = {0355.10034},
url = {http://dml.mathdoc.fr/item/GDZPPN002480425}
}
Erdös, Paul; Richards, Ian. Density Functions for Prime and Relatively Prime Numbers.. Monatshefte für Mathematik, Tome 84 (1977) pp. 99-112. http://gdmltest.u-ga.fr/item/GDZPPN002480425/