@ARTICLE{
author={Sokic Miroslav D,Vuckovic Natasa,Ilic Ilija B,Zivkovic Dragana T},
year={2008},
title={Investigation of mechanism and kinetics of chalcopyrite concentrate oxidation process},
journal={METALURGIJA},
volume={47},
number={2},
pages={109-113},
document_type={Article},
} 

@ARTICLE{
author={Vracar Rajko Z,Vuckovic Natasa,Kamberovic Zeljko J},
year={2003},
title={Leaching of copper(I) sulphide by sulphuric acid solution with addition of sodium nitrate},
journal={HYDROMETALLURGY},
volume={70},
number={1-3},
pages={143-151},
document_type={Article},
}