Artur Dziedzic. THE INFLUENCE OF LOADING SPEED IN THE CLASSICAL BRAZILIAN TESTS ON AN ESTIMATE VALUE OF FRACTURE TOUGHNESS INDICATOR (KIC) FOR EXAMPLE POLISH FLYSCH SANDSTONES. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 14th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2014. https://doi.org/10.5593/sgem2014/b12/s2.118