@article{bwmeta1.element.bwnjournal-article-aav13i4p395bwm,
author = {Rotkiewicz, A. and Halberstam, H.},
title = {A gap theorem for pseudoprimes in arithmetic progressions},
journal = {Acta Arithmetica},
volume = {13},
year = {1968},
pages = {395-404},
zbl = {0155.09201},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav13i4p395bwm}
}
Rotkiewicz, A.; Halberstam, H. A gap theorem for pseudoprimes in arithmetic progressions. Acta Arithmetica, Tome 13 (1968) pp. 395-404. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav13i4p395bwm/