1. Yuhr L, Benson RC, Sharma D. Achieving a reasonable level of accuracy in site characterization in the presence of geologic uncertainty. In: Charles DS, editor. Uncertainty in the geologic environment: from theory to practice, Proceedings of Uncertainty 96, New York, 1996. p. 195–209.
2. Cromer MV. Geostatistics for environmental and geotechnical applications: a technology transferred. In: Shahrokh R, editor. Proceedings of geostatistics for environmental and geotechnical applications, Phoenix, AZ, 1996. p. 3–12.
3. Engineering rock mechanics;Harrison,2000
4. Ayalew L. Weathered rock mass characterization considering uncertainty, with an example from the Gilgel Gibe hydropower project in Ethiopia. Ph.D. thesis, Aachen, Shaker Verlag, 2001.
5. Ethiopian Electric Power Corporation (EEPCO). Gilgel Gibe hydroelectric study project: powerhouse area geological and geomechanical report, Addis Ababa, 1997.