TY  - JOUR
AU  - Jean-Marie De Koninck
AU  - Florian Luca
TI  - On the composition of
 the Euler function and the sum of divisors function
JO  - Colloquium Mathematicum
PY  - 2007
SP  - 31
EP  - 51
VL  - 108
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm108-1-4/
DO  - 10.4064/cm108-1-4
LA  - en
ID  - 10_4064_cm108_1_4
ER  -