@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa100-4-1,
author = {Kevin Ford and Richard H. Hudson},
title = {Sign changes in $$\pi$\_{q,a}(x) - $\pi$\_{q,b}(x)$
},
journal = {Acta Arithmetica},
volume = {100},
year = {2001},
pages = {297-314},
zbl = {0986.11063},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa100-4-1}
}
Kevin Ford; Richard H. Hudson. Sign changes in $π_{q,a}(x) - π_{q,b}(x)$
. Acta Arithmetica, Tome 100 (2001) pp. 297-314. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa100-4-1/