1. Stress-conditions in triaxial compression;Balla;J. Soil Mech. Found. Div., Am. Soc. Civ. Engr.,1960
2. Contribution to discussion on a rigid 50-ton compression testing machine;Bieniawski;S. Afr. Mech. Engr.,1966
3. Brittle fracture of rocks;Brace,1964
4. Controlled failure of hollow rock cylinders in uniaxial compression;Brown,1971
5. Study of the failure of rock surrounding underground excavations;Cook,1962