@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/