TY  - JOUR
TI  - Fraud Risk Management for GSM Systems
AU  - TÜFEKÇİOĞLU, O.
AU  - BİRİCİK, G.
AU  - DİRİ, B.
JO  - Sigma Journal of Engineering and Natural Sciences
PY  - 2017
VL  - 8
SP  - 169
EP  - 174
DO  - 
ER  -