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Li, V.C., Chong, K.P., and Einstein, H.H. (1989). Tension softening and size effects on the fracture determination of geomaterials. In S.P. Shah, S.E. Swartz (eds.): Proceedings of the SEM-RILEM International Conference on Fracture in Concrete and Rock, Houston, Texas, 17-19 June 1987, pp. 255-264. Springer New York 1989. ISBN: 978-0387968803 (Print) 978-1461235781 (Online) doi:10.1007/978-1-4612-3578-1_25