STUDY OF THE DEPENDENCE BETWEEN THE CUTTING DIRECTION RELATIVE TO STRATIFICATION AND THE DIGGING CHARACTERISTICS OF LIGNITE IN OLTENIA COAL BASIN (ROMANIA)
Ovidiu Bogdan Tomus, Andrei Andras, Iosif Andras · SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Science and Technologies in Geology, Exploration and Mining


