TY - CPAPER AU - Barbara Bielowicz TI - THE CONTENT OF RADIOACTIVE ELEMENTS IN THE POLISH LIGNITE AND ITS 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 - 597 EP - 604 DO - 10.5593/sgem2017/11/s01.075 PB - STEF92 Technology ER -