@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa138-4-4,
author = {Mohand-Ouamar Hernane and Florian Luca},
title = {On the independence of s(ph(n)) and ph(s(n))},
journal = {Acta Arithmetica},
volume = {139},
year = {2009},
pages = {337-346},
zbl = {1261.11061},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa138-4-4}
}
Mohand-Ouamar Hernane; Florian Luca. On the independence of σ(ϕ(n)) and ϕ(σ(n)). Acta Arithmetica, Tome 139 (2009) pp. 337-346. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa138-4-4/