1. A non-destructive concrete tester;Schmidt;Concrete,1951
2. Eberhardt E. White paper on the Schmidt hammer and its applicability to landslide investigations. In: Internal newsletter of the multinational Andean project: geoscience for Andean communities, vol. 3. Vancouver, Canada, March 2004, p. 12.
3. Ceylanoglu A., Arpaz E., Gorgulu K., Hardness determination of some rock units and their relations with other material properties, In: Proceedings of the 16th Mining Congress of Turkey, 1999, ISBN:975-395-310-0.
4. The Schmidt hammer in geomorphological research;Goudie;Prog Phys Geogr,2006
5. Index properties and strength variation controlled by microstructure for sedimentary rocks;Sabatakakis;Eng Geol,2008