@ARTICLE{
author={Ljubojev Milenko|,Popovic Ratomir|,Bugarin Mile M|,Ignjatovic Dragan M|0000-0002-8941-4108,Djurdjevac-Ignjatovic Lidija|},
year={2014},
title={Defining Parameters of Shear Resistance on Oil Shale Samples},
journal={MATERIALS RESEARCH AND APPLICATIONS, PTS 1-3},
volume={875-877},
number={},
pages={647-651},
document_type={Proceedings Paper},
} 

@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},
}