@article{bwmeta1.element.bwnjournal-article-aav7i2p107bwm,
author = {Knapowski, Stanis\l aw},
title = {On sign-changes of the difference $\pi$(x)-li(x)},
journal = {Acta Arithmetica},
volume = {7},
year = {1962},
pages = {107-119},
zbl = {0126.07502},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav7i2p107bwm}
}
Knapowski, Stanisław. On sign-changes of the difference π(x)-li(x). Acta Arithmetica, Tome 7 (1962) pp. 107-119. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav7i2p107bwm/