@ARTICLE{
author={Djatkov Djordje M,Effenberger Mathias,Martinov Milan L},
year={2014},
title={Method for assessing and improving the efficiency of agricultural biogas plants based on fuzzy logic and expert systems},
journal={APPLIED ENERGY},
volume={134},
number={},
pages={163-175},
document_type={Article},
} 

@ARTICLE{
author={Djatkov Djordje M,Effenberger Mathias,Lehner Andreas,Martinov Milan L,Tesic Milos,Gronauer Andreas},
year={2012},
title={New method for assessing the performance of agricultural biogas plants},
journal={RENEWABLE ENERGY},
volume={40},
number={1},
pages={104-112},
document_type={Article},
}