TY  - JOUR
AU  - A. M. Aghdam
AU  - A. Najafizadeh
TI  - Square subgroups of rank two abelian groups
JO  - Colloquium Mathematicum
PY  - 2009
SP  - 19
EP  - 28
VL  - 117
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm117-1-2/
DO  - 10.4064/cm117-1-2
LA  - en
ID  - 10_4064_cm117_1_2
ER  -