1. Engineering Rock Mass Classification;Bieniawski,1989
2. Palmström A. Measurement and characterization of rock mass jointing, In: Sharma VM, Saxena KR, (Eds)., In situ characterization of rocks, 2001. New Delhi: Oxford & IBH Publishing Co. Pvt. Ltd., and Rotterdam: A.A. Balkema, 358.
3. The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974–2006;ISRM,2007
4. Estimation of discontinuity spacing and trace length using scanline surveys;Priest;Int J Rock Mech Min Sci,1981
5. Discontinuity Analysis for Rock Engineering;Priest,1993