@ARTICLE{
author={Milanovic Jovana Z,Milanovic Predrag M,Kragic Rastislav B,Kostic Mirjana MI},
year={2018},
title={"Do-It-Yourself" reliable pH-stat device by using open-source software, inexpensive hardware and available laboratory equipment},
journal={PLOS ONE},
volume={13},
number={3},
pages={-},
document_type={Article},
} 

@ARTICLE{
author={Cvetkovic Slobodan M,Kaludjerovic-Radoicic Tatjana S,Kragic Rastislav B,Kijevcanin Mirjana Lj},
year={2016},
title={Electricity Production from Biogas in Serbia Assessment of Emissions Reduction},
journal={THERMAL SCIENCE},
volume={20},
number={4},
pages={1333-1344},
document_type={Article; Proceedings Paper},
}