@article{bwmeta1.element.zamlynska-304137de-261f-4bed-ae12-8272aeff9409,
author = {P. Erd\"os},
title = {Some remarks on the iterates of the $\phi$ and $\sigma$ functions},
journal = {Colloquium Mathematicae},
volume = {18},
year = {1967},
pages = {195-202},
zbl = {0173.03903},
language = {fra},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.zamlynska-304137de-261f-4bed-ae12-8272aeff9409}
}
P. Erdös. Some remarks on the iterates of the φ and σ functions. Colloquium Mathematicae, Tome 18 (1967) pp. 195-202. http://gdmltest.u-ga.fr/item/bwmeta1.element.zamlynska-304137de-261f-4bed-ae12-8272aeff9409/