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Einstein, H.H., Dudt J.P., Halabe, V.B., and Descoeudres, F. (1996). Geologic uncertianties in tunneling. In: Uncertainty in the Geologic Environment: from Theory to Practice, proceedings of Uncertainty ’96, a specialty conference of the ASCE Geotechnical Engineering Division, July 31-August 3, Madison, Wisconsin, USA. Geotechnical Special Publication 58 (C.D. Shackelford et al., eds.), pp. 239-253. Published by the American Society of Civil Engineers, 1996. ISBN 978-0784401880