1. Maurer W. C. The state of rock mechanics knowledge in drilling. Proc. 8th Symp. Rock Mech., Univ. of Minn., 335–395.
2. Penetration problems in rock mechanics;Sikarskie,1974
3. Propagation of rittle fracture in rock;Bieniawski,1968
4. Brittle fracture propagation in rock under compression;Hoek;Int. J. Fract. Mech.,1965
5. Reasearches into the complete stress-strain curve for concrete;Barnard;Mag. Concr. Res.,1964