@ARTICLE{
author={Kostic Stefan M,Simic Mirjana I,Kostic Miroljub V},
year={2020},
title={Social Network Analysis and Churn Prediction in Telecommunications Using Graph Theory},
journal={ENTROPY},
volume={22},
number={7},
pages={-},
document_type={Article},
} 

@ARTICLE{
author={Milojkovic Jelena Z,Jankovic Sladjana R,Kostic Miroljub V,Despotovic-Zrakic Marijana S,Bogdanovic Zorica M},
year={2012},
title={Building Public Key Infrastructure for E-Government},
journal={METALURGIA INTERNATIONAL},
volume={17},
number={10},
pages={227-234},
document_type={Article},
}