1. Suggested methods for the quantitative description of discontinuities;International Society for Rock Mechanics;Int. J. Rock Mech. Min. Sci. & Geomech. Abstr.,1978
2. Technical description of rock cores for engineering purposes;Deere;Rock Mech. Engng Geol.,1963
3. Geological factors significant to the stability of slopes cut in rock;Piteau,1970
4. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mech.,1974
5. Index properties and observations for design of chambers in rock;Cording;Engng Geol.,1978