Vesselina Pavlova (2014). DATA ANALYSIS FROM THE MONITORING OBSERVATIONS OF GROUNDWATER LEVELS IN THE SARMATIAN AQUIFER IN NORTHEASTERN BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. https://doi.org/10.5593/sgem2014/b12/s2.033