@ARTICLE{
author={Ljubojev Milenko,Popovic Ratomir,Bugarin Mile M,Ignjatovic Dragan M,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},
}