TY  - JOUR
AU  - Ivić Aleksandar
TI  - Two inequalities 

 for the sum of divisors functions
JO  - Novi Sad Journal of Mathematics
PY  - 1977
SP  - 17
EP  - 22
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/NSJOM_1977_7_Nonea_2/
ID  - NSJOM_1977_7_Nonea_2
ER  -