Link

Einstein, H.H., Veneziano, D., Baecher, G.B., and O’Reilly, K.J. (1983). The effect of discontinuity persistence on rock slope stability. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 20 (5), 227-236. doi:10.1016/0148-9062(83)90003-7