Resss. Assoc. Boriana Chakalova (2013). HYDROCHEMICAL CONDITIONS IN THE REGION OF DOBRUDZHA COAL DEPOSIT (NE BULGARIA). SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 187 - 194 pp. https://doi.org/10.5593/sgem2013/ba1.v2/s02.025