Beacher, G. B., Lanney, N. A., and Einstein, H. H., 1977- Statistical description of rock properties and sampling. In: 18th U. S. Symposium on Rock Mechanics, 5C1- 8. of joint set characteristics from surface mapping data, in the 17th U. S. Symposium on Rock Mechanics, 2B2-1-9.
Deere, D. U., 1963- Technical description of rock cores for engineering purposes. Rock Mechanics Engineering Geology, Vol. 1, pp. 18-22.
Priest, S. D. and Hudson, J., 1976- Discontinuity spacing of rock. Rock mechanics, Vol. 13, pp. 135-148.
Priest, S. D. and Hudson, J., 1981- Estimation of discontinuity spacing and trace length using scanline survey; Rock Mechanics, Vol. 18, pp. 183-197.
Robertson, A., 1970- The interpretation of geologic factors for use in slope stability. In proceedings, Symposium on the theoretical background to the planning of open pit mines with special reference to slope stability. South African Institute of Mining and Metallurgy, Johannesburg, South Africa, pp. 55-71.
Ryckes, K. D., 1984- A Routine Method to Evaluate the Modes of Failure and the Stability of Rock Slopes: Unpublished MS Thesis, imperial College of Science and Technology, London, England, 246 p.
Sen, Z., 1984- RQD models and fracture spacing. Journal of Geotechnical Engineering, American Society of Civil Engineers, Vol. 110, no. 2, pp. 203-216.
Sen, Z., 1990 a RQP and rock fracture. Rock Mechanics, Vol. 27, pp. 235-137.
Sen, Z., 1990 b- Cumulative core index for rock quality evaluations. Rock mechanics, Vol. 27, pp. 87-94.
Sen, Z., and Kazi, A. 1984- Discontinuity spacing and RQD estimates from finite length scanlines: Rock mechanics, Vol. 21, No. 4, pp. 23212.
Walits, P. F., and King, M. S., 1980- Discontinuity spacings in a crystalline rock. Rock Mechanics, Vol. 17, pp. 63-66.
