1. Suggested methods for determining hardness and abrasiveness of rocks;ISRM,1981
2. The Schmidt hammer in rock material characterization;Aydin;Eng Geol,2005
3. The Schmidt hammer as a measure of degree of rock surface weathering and terrain age;McCarroll,1994
4. A method for normalization of Schmidt hammer rebound values;Basu;Int J Rock Mech Min Sci,2004
5. Suggested methods for the quantitative description of discontinuities in rock masses;ISRM,1981