@ARTICLE{
author={Brkic Miodrag V,Obradovic Djordje D,Dogan Viktor,Karoly Barta,Zivanov Milos B},
year={2013},
title={Acoustic Measurement and Monitoring System for Level of Groundwater},
journal={SENSOR LETTERS},
volume={11},
number={9},
pages={1627-1631},
document_type={Article},
} 

@ARTICLE{
author={Brkic Miodrag V,Obradovic Djordje D,Dudarin Zorica,Karoly Barta,Zivanov Milos B},
year={2013},
title={Measurement and monitoring system for level of groundwater},
journal={MATERIALS AND APPLICATIONS FOR SENSORS AND TRANSDUCERS II},
volume={543},
number={},
pages={243-246},
document_type={Proceedings Paper},
}