Stehle, T., Eisseler, R., Drewle, K., Weiland, S. and Twiefel, J. (2015) “Investigation of process forces of ultrasonically assisted scratch tests”, International Conference on Stone and Concrete Machining (ICSCM), 30, pp. 137-145. doi: 10.13154/icscm.3.2015.137-145.