TY - CPAPER AU - Dolea Gheorghe Gabriel TI - CONSIDERATIONS REGARDING THE DEVELOPMENT OF AN ECONOMIC-MATHEMATICAL MODEL FOR OPTIMIZING THE TECHNOLOGICAL VARIANTS IN THE COAL MINE FACES T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING PY - 2014 DO - 10.5593/sgem2014/b13/s3.022 PB - Stef92 Technology ER -