1. Development of rock mass classification system to obtain optimum slope design parameters of open pit mines in weak rock masses;Aksoy,1997
2. Standard test method for slake durability of shales and similar weak rocks (D4644),1990
3. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mech.,1974
4. Engineering classification of jointed rock masses;Bieniawski;Trans. S. Afr. Inst. Civ. Eng.,1973
5. The geomechanics classification in rock engineering applications;Bieniawski,1979