@article{bwmeta1.element.bwnjournal-article-aav8i4p349bwm,
author = {de Bruijn, N. and van Lint, J.},
title = {On the number of integers $\leq$ x whose prime factors divide n},
journal = {Acta Arithmetica},
volume = {8},
year = {1963},
pages = {349-356},
zbl = {0201.37601},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav8i4p349bwm}
}
de Bruijn, N.; van Lint, J. On the number of integers ≤ x whose prime factors divide n. Acta Arithmetica, Tome 8 (1963) pp. 349-356. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav8i4p349bwm/