Further Reading
- Bieniawski, Z.T. (1989). Engineering Rock Mass Classifications. Wiley-Interscience. p. 272. ISBN 978-0-471-60172-2.
- Hack, H.R.G.K. (25-28 November 2002). "An evaluation of slope stability classification. Keynote Lecture.". In Dinis da Gama, C.; Ribeira e Sousa, L.. Proc. ISRM EUROCK’2002. Funchal, Madeira, Portugal: Sociedade Portuguesa de Geotecnia, Lisboa, Portugal. pp. 3–32. ISBN 972-98781-2-9.
- Palmstrom, A.; Broch, E. (2006). "Use and misuse of rock mass classification systems with particular reference to the Q-system". Tunnelling and Underground Space Technology 21 (6): 575–593. doi:10.1016/j.tust.2005.10.005.
- Pantelidis, L. (2009). "Rock slope stability assessment through rock mass classification systems". International Journal of Rock Mechanics and Mining Sciences 46 (2): 315–325. doi:10.1016/j.ijrmms.2008.06.003.
- Singh, B.; Goel, R.K. (1999). Rock Mass Classification: A Practical Approach in Civil Engineering. Elsevier Science. p. 282. ISBN 978-0-08-043013-3.
- Singh, B.; Goel, R.K. (2006). Tunnelling in Weak Rocks. Geo-Engineering. 5. Elsevier Science. p. 512. ISBN 978-0-08-044987-6.
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