1. Determining rocks strength with specimens of irregular shape;Protodyakonov;Ugol,1957
2. Strength Research,1961
3. Determination of compressive strength of rocks by testing irregular specimens;Singh;J. Mines Metals Fuels,1974
4. A simple method for assessing the uniaxial compressive strength of rock;Hobbs;Int. J. Rock Mech. Min. Sci.,1963
5. Point-load testing of brittle materials to determine tensile strength and relative brittleness;Reichmuth,1968