J. AuguĊ›cik. THE VARIABILITY IN THE CONTENT OF RARE EARTH ELEMENTS (Ce, La, Sc, and Y) IN BITUMINOUS COAL (LUBLIN COAL BASIN). SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Mining, 2018, pp. 603-610. https://doi.org/10.5593/sgem2018/1.1/s01.076