@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/