@article{05068456,
title = {On the sum of iterations of the Euler function.},
journal = {Journal of Integer Sequences [electronic only]},
volume = {9},
year = {2006},
zbl = {1107.11040},
language = {en},
url = {http://dml.mathdoc.fr/item/05068456}
}
Shparlinski, Igor E. On the sum of iterations of the Euler function.. Journal of Integer Sequences [electronic only], Tome 9 (2006) . http://gdmltest.u-ga.fr/item/05068456/