TY - CPAPER AU - Henryk Swinder AU - Barbara Bialecka AU - Andrzej Jarosinski TI - RECOVERY OF RARE EARTH ELEMENTS FROM COAL COMBUSTION FLY ASHES T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Science and Technologies in Geology, Exploration and Mining PY - 2017 SP - 995 EP - 1002 DO - 10.5593/sgem2017/11/s04.127 PB - STEF92 Technology ER -