M. HLAVATA, L. CABLIKOVA, E. KONECNA, J. ISEK, B. TORA. "CLOSED-CIRCUIT FLOTATION OF BLACK COAL." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING (2014). https://doi.org/10.5593/sgem2014/b13/s4.110