1. Hoek, Evert. 2007. Practical Rock Engineering.
2. Itasca Inc. 2018. Fish in UDEC 7.0.
3. Itasca Inc. 2018. UDEC 7.0 User’s Guide.
4. Read, John, and Peter Stacey, eds. 2010. Guidelines for Open Pit Slope Design. Collingwood, Vic: CSIRO Publ.
5. Rosenbleuth, E. 1981. Two-point estimates in probabilities. J. Appl. Math. Modelling 5, October, 329-335.