1. Lacasse S, Nadim F. Uncertainty in characterising soil properties (plenary). In: Uncertainty in the geologic environment, from theory to practice. Proceeding of uncertainty 1996. Geotechnical Special Publication No. 58, 1996.
2. Jones AL, Kramer SL, Arduino P. Estimation of uncertainty in geotechnical properties for performance-based earthquake engineering. Technical Report 2002/16, Pacific Earthquake Engineering Research Center, PEER; 2002.
3. The variability of natural soils;Lumb;Canadian Geotechnical Journal,1966
4. Safety factors and the probability distribution of soil strength;Lumb;Canadian Geotechnical Journal,1970
5. Grivas DA. How reliable are the present slope failure prediction methods? In: Proceedings of the tenth international conference of soil mechanics and foundation engineering, vol. 3, Stockholm, Sweden, 1981. p. 427–30.