1. Chunsheng Zhao. Recent progress in ultrasonic motor techniques. Journal of Vibration, Measurement & Diagnosis, 2004, 24(1): 1–5. (in Chinese)
2. Huafeng Li. Research on Ultrasonic Motor Driver. Post-doctoral Report. Nanjing: Nanjing University of Aeronautics and Astronautics, 2004. (in Chinese)
3. Jiakui Zu. Research on Driving and Control Techniques for Traveling-Wave Ultrasonic Motor Based on Its Electric Characteristics. Post-doctoral Report. Nanjing: Nanjing University of Aeronautics and Astronautics, 2004. (in Chinese)
4. Zhihua Chen. Research on the Control of Ultrasonic Motors. Post-doctoral Report. Nanjing: Nanjing University of Aeronautics and Astronautics, 2003. (in Chinese)
5. Huafeng Li. Study on Ultrasonic Motor and Its Precise Servo-control System. Dissertation for the Degree of Doctor of Philosophy. Wuhan: Huazhong University of Science and Technology, 2002. (in Chinese)