Einstein, H.H., and Baecher, G.B. (1982). Probabilistic and Statistical Methods in Engineering Geology I. Problem Statement and Introduction to Solution. In L. Müller (ed.): Engineering Geology and Geomechanics as Fundamentals of Rock Engineering, Chapter 4, 47-61. Suppl. volume 12 of the series Rock Mechanics. Springer Vienna, 1982. ISBN 978-3211816974 (Print) 978-3709186657 (Online) doi:10.1007/978-3-7091-8665-7_4