1. Henderson D A. Simple ceramic motor, inspiring smaller products. In: Actuator 2006, 10th International Conference on New Actuators, Bremen, Germany, 14–16 June, 2006
2. Maeno T. Recent progress of ultrasonic motors in Japan. In: The First International Workshop on Ultrasonic Motors and Actuators, Yokohama, Japan, 2005. 15–17
3. Zheng D X, Jin Y X, Cui J M, et al. The small discreteness of lens (in Chinese). Chinese Patent, Patent No. CN1664641A
4. Yoon S J. Development of linear ultrasonic motors. In: The First International Workshop on Ultrasonic Motors and Actuators, Yokohama, Japan, 2005. 7–8
5. Lu C Y. The study and application of new type of micro USM (in Chinese). Postdoctoral Report. Beijing: Tsinghua University, 2006