Jan Štefaňák. "RECENT PROGRESS IN TESTING OF GROUND ANCHORS." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining (2019): 447-454. https://doi.org/10.5593/sgem2019/1.2/s02.057