@ARTICLE{
author={Ilijevic Konstantin,Grzetic Ivan A,Zivadinovic Ivan,Popovic Aleksandar R},
year={2012},
title={Long-term seasonal changes of the Danube River eco-chemical status in the region of Serbia},
journal={ENVIRONMENTAL MONITORING AND ASSESSMENT},
volume={184},
number={5},
pages={2805-2828},
document_type={Article},
} 

@ARTICLE{
author={Zivadinovic Ivan,Ilijevic Konstantin,Grzetic Ivan A,Popovic Aleksandar R},
year={2010},
title={Long-term changes in the eco-chemical status of the Danube River in the region of Serbia},
journal={JOURNAL OF THE SERBIAN CHEMICAL SOCIETY},
volume={75},
number={8},
pages={1125-1148},
document_type={Article},
}