1. Aitchison, J. and Dunsmore, I. R., 1978, Statistical prediction analysis: Cambridge University Press.
2. Baecher, G. B., Lanney, N. A., and Einstein, H. H., 1977a, Trace length bias in joint surveys, 20th U.S. national symposium on rock mechanics: Lake Tahoe, Nevada.
3. Baecher, G. B., Lanney, N. A., and Einstein, H. H., 1977b, Statistical descriptions of rock properties and sampling, 19th U.S. national symposium on rock mechanics: Keystone, Colorado.
4. Bartholomew, D. J., 1957, A problem in life testing: Jour. Am. Stat. Assn., v. 52, pp. 350?55.
5. Cruden, D. M., 1977, Describing the size of discontinuities: Rock Mech. Min. Sci., v. 14, pp. 133?137.