@article{01376190, title = {On the iterates of the sum of exponential divisors.}, journal = {Mathematica Pannonica}, volume = {10}, year = {1999}, pages = {153-158}, zbl = {0929.11035}, language = {en}, url = {http://dml.mathdoc.fr/item/01376190} }
Kátai, I.; Subbarao, M.V. On the iterates of the sum of exponential divisors.. Mathematica Pannonica, Tome 10 (1999) pp. 153-158. http://gdmltest.u-ga.fr/item/01376190/