Krzysztof Wierzchowski, Joanna Calus Moszko, Barbara Bialecka (2017). PRELIMINARY ASSESSMENT OF THE POSSIBILITIES OF CONCENTRATING THE RARE EARTH METALS BY FLOTATION FROM THE POWER PLANT ASHES. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Science and Technologies in Geology, Exploration and Mining, 973-978. https://doi.org/10.5593/sgem2017/11/s04.124