@inproceedings{sgem2015s2085,
  title = {SHEAR STRENGTH OF ROCKS BY VISUAL ASSESSMENT},
  author = {Ficker, Tomas and Martisek, Dalibor},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING},
  year = {2015},
  pages = {641-648},
  publisher = {Stef92 Technology},
  doi = {10.5593/sgem2015/b12/s2.085}
}