1. Dershowitz W, Busse R, Geier J, Uchida M (1996) A stochastic approach for fracture set definition. In: Aubertin M, Hassani F, Mitri H (eds) Proceedings of the 2nd North American rock mechanics symposium (NARMS ’96), rock mechanics: tools and techniques, Montreal, Quebec, June 1996, pp 1809–1813
2. Hammah RE, Curran JH (1998) Fuzzy cluster algorithm for the automatic identification of joint sets. Int J Rock Mech Min Sci 35(7):889–905. doi: 10.1016/S0148-9062(98)00011-4
3. Hammah RE, Curran JH (1999) On distance measures for the fuzzy K-means algorithm for joint data. Rock Mech Rock Eng 32(1):1–27. doi: 10.1007/s006030050041
4. Harrison JP (1992) Fuzzy objective functions applied to the analysis of discontinuity orientation data. In: Hudson JA (ed) Rock characterization. Proceedings of the international society of rock mechanics (ISRM) symposium, Eurock’92, Chester, UK, September 1992. Thomas Telford, British Geotechnical Society, London, pp 25–30
5. Jimenez R (2008) Fuzzy spectral clustering for identification of rock discontinuity sets. Rock Mech Rock Eng 41:929–939. doi: 10.1007/s00603-007-0155-6