1. Assessment of ease of excavation of surface mines;Hadjigeorgiou;J. Terramech. Pergamon,1998
2. Challenges of excavation by ripping works in weathered sedimentary zone;Mohamad;Electron. J. Geotech. Eng.,2011
3. A rippability classification system for marls in lignite mines;Basarir;Eng. Geol.,2004
4. A fuzzy logic based rippability classification system;Basarir;J. S. Afr. Inst. Min. Metall.,2007
5. R.N. Singh, A.M. Elmherig, M.Z. Sunu, Application of rock mass characterization to the stability assessment and blast design in hard rock surface mining excavations, in: Proceedings of the 27th US Symposium on Rock Mechanics. Alabama, 1986, pp. 471–478.