TY  - JOUR
AU  - Carl Pomerance
TI  - On the composition of the arithmetic functions σ and φ
JO  - Colloquium Mathematicum
PY  - 1989
SP  - 11
EP  - 15
VL  - 58
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-58-1-11-15/
DO  - 10.4064/cm-58-1-11-15
LA  - en
ID  - 10_4064_cm_58_1_11_15
ER  -