@article{05019508,
title = {Square-free values of the Carmichael function.},
journal = {Mathematica Pannonica},
volume = {16},
year = {2005},
pages = {199-203},
zbl = {1119.11055},
language = {en},
url = {http://dml.mathdoc.fr/item/05019508}
}
Kátai, Imre. Square-free values of the Carmichael function.. Mathematica Pannonica, Tome 16 (2005) pp. 199-203. http://gdmltest.u-ga.fr/item/05019508/