1. Suggested methods for the quanitative description of discontinuities in rock masses;Bamford;Int. J. Rock Mech. Min. Sci. & Geomech. Abstr.,1978
2. Fractals—Form, Chance and Dimension;Mandelbrot,1977
3. Multiple modes of shear failure in rock;Patton,1966
4. Methods of Geological Engineering;Goodman,1976
5. Review of a new shear strength criterion for rock joints;Barton,1973