1. An introduction to Ultrasonic Motors;Sashida,1993
2. J. Maas, P. Ide, N. Fröhleke, H. Grotstollen, Simulation model for ultrasonic motors powered by resonant converters, in: IEEE Industry Applications Conference, Orlando, FL, 1995, pp. 111–120.
3. Model-based control for ultrasonic motors;Maas;IEEE/ASME Trans. Mech.,2000
4. Modeling of a piezoelectric rotary ultrasonic motor;Hagood;IEEE Trans. Ultrasonics, Ferroelectrics, Frequency Control,1995
5. A note on the contact problem in an ultrasonic travelling wave motor;Schmidt;Int. J. Non-Linear Mech.,1996