@ARTICLE{
author={Bugarin Mile M,Ivkovic Mirko,Ljubojev Vesna,Ljubojev Milenko,Rakic Dragoslav R},
year={2012},
title={Natural and geological conditions of coal mining in the pits of the brown coal mine "Rembas" - Resavica},
journal={TECHNICS TECHNOLOGIES EDUCATION MANAGEMENT-TTEM},
volume={7},
number={2},
pages={673-678},
document_type={Article},
} 

@ARTICLE{
author={Ivkovic Mirko,Bugarin Mile M,Ljubojev Milenko,Ljubojev Vesna,Rakic Dragoslav R},
year={2012},
title={Categorization of underground coal mines in Serbia related to the potential risks depending on natural - geological conditions},
journal={TECHNICS TECHNOLOGIES EDUCATION MANAGEMENT-TTEM},
volume={7},
number={2},
pages={469-474},
document_type={Article},
} 

@ARTICLE{
author={Ljubojev Milenko,Popovic Ratomir,Avdic Melvudin,Djurdjevac-Ignjatovic Lidija,Ljubojev Vesna},
year={2010},
title={Defining the legality of gray sandstone rock strength testing in a complex state of stress},
journal={TECHNICS TECHNOLOGIES EDUCATION MANAGEMENT-TTEM},
volume={5},
number={3},
pages={437-443},
document_type={Article},
}