TY - CPAPER AU - Bartlomiej Liana AU - Bartosz Papiernik TI - NATURAL AND DRILLING INDUCED FACTORS INFLUENCING THE BRITTLENESS ESTIMATION BASED ON SONIC LOGS 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 - 741 EP - 748 DO - 10.5593/sgem2017/14/s06.093 PB - STEF92 Technology ER -