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2. Ultraprecision 6-axis Table Driven by Means of a Walking Drive;Shamoto;Annals of the CIRP,2000
3. An Introduction to Ultrasonic Motors;Sashida,1993
4. Devos, S., Reynaerts, D., Van Brussel, H., 2005, Minimising Heat Dissipation in Ultrasonic Piezomotors by Working in a Resonant Mode, J. of Prec. Eng. Submitted