@article{05606308,
title = {On perfect numbers connected with the composition of arithmetic functions.},
journal = {Acta Universitatis Sapientiae. Mathematica},
volume = {1},
year = {2009},
pages = {183-191},
zbl = {1220.11004},
language = {en},
url = {http://dml.mathdoc.fr/item/05606308}
}
Sándor, József; Kovács, Lehel István. On perfect numbers connected with the composition of arithmetic functions.. Acta Universitatis Sapientiae. Mathematica, Tome 1 (2009) pp. 183-191. http://gdmltest.u-ga.fr/item/05606308/