Izabela Jonek-Kowalska. SOURCES OF RISK IN THE PROCESS OF MINING PRODUCTION PLANNING IN A HARD COAL MINE. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Ecology, Economics, Education and Legislation, 2018, pp. 735-742. https://doi.org/10.5593/sgem2018/5.3/s28.094