P. I. Tsoi. COMPARATIVE ANALYSIS OF COHESION COEFFICIENTS AND INTERNAL FRICTION ANGLES OF ROCKS DEPENDING ON THE FUNCTIONAL TYPE OF THE MOHR-COULOMB ENVELOPE.. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining, 2019, pp. 119-126. https://doi.org/10.5593/sgem2019/1.3/s03.015