E. Sermet. "LITHOLOGICAL TYPES OF SULPHUR ORE AND THEIR INFLUENCE ON SMELTABILITY." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining, 2019, pp. 287-294. https://doi.org/10.5593/sgem2019/1.1/s01.035