1. American society for testing and materials. Standard test method for unconfined compressive strength of intact rock core specimens. ASTM Designation D 2938-79, ASTM standards 4.08: Philadelphia; 1984.
2. American society for testing and materials. Standard test method for triaxial compressive strength of undrained rock core specimens without pore pressure measurements. ASTM designation D 2664-67 (reapproved 1974), ASTM standards 4.08: Philadelphia; 1984.
3. Suggested methods for determining the strength of rock materials in triaxial compression. In: Brown ET, editor. Rock characterization, testing and monitoring—ISRM suggested methods. Oxford: Pergamon Press; 1981.
4. Suggested methods for determining the uniaxial compressive strength and deformability of rock materials. In: Brown ET, editor. Rock characterization, testing and monitoring—ISRM suggested methods. Oxford: Pergamon Press; 1981.
5. Suggested methods for determining the strength of rock materials in triaxial compression—revised version;Kovari;Int J Rock Mech Min Sci,1983