1. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mech.,1974
2. Rock mass classifications in rock engineering;Bieniawski,1976
3. Laboratory tests of certain rocks under axially symmetrical loading conditions;Bodonyi,1970
4. Triaxial strength behaviour of some Indian coals;Das;J. Mines Metals Fuels,1986
5. Strength variations and deformational behaviour in anisotropic rock;Donath,1964