NICOLAE LUDUSAN. NB AND TA MINERALS FOUND IN ORASTIE MOUNTAINS, ROMANIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2013. https://doi.org/10.5593/sgem2013/ba1.v1/s01.018