Einstein, H.H. (1994). Determining of rock engineering properties – Objective and subjective assessment of uncertainty. Keynote lecture. In Integral Approach to Applied Rock Mechanics: proceedings of the 1994 ISRM International Symposium, IV Congreso Sudamericano de Mecanica de Rocas (M. Van Sint Jan, et al., eds.), Santiago de Chile, Chile. Published by Editec, 1994. ISBN 978-9567141104