1. M. Es. Abdel Moneim, private communication with A. S. Abou-Sayed, Applied Mechanics Research, University Research Park, Salt Lake City, Sept. 1978.
2. Engineering classification and index properties for intact rocks;Deere,1965
3. Rock mechanics and design of structures in rock;Obert;Spec. Tech. Publ.,1966
4. Influence of stress rate and other factors on strength and elastic properties of rocks;Wuerker;Q. Colo. Sch. Mines,1959
5. Effect of the straining rate on the compressive strength and elastic properties of concrete;Watstein;J. Am. Concr. Inst.,1953