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 K. T. Chau, B. Shi, L. Jing, M.-Q. Hu and Y. Fan, “A Short Cylinder Ultrasonic Motor with Novel Excitation Mode,” Industry Applications Conference of 39th IAS Annual Meeting. Conference Record of the 2004 IEEE, Vol. 1, 3-7 October 2004, pp. 360-365.
 T. Kanda, A. Makino, K. Suzumori, T. Morita and M. K. Kurosawa, “Characteristics, Modeling and Simulation of a Traveling Wave Ultrasonic Linear Motor,” 2004 IEEE Ultrasonics Symposium, Vol. 3, 23-27 August 2004, pp. 2247-2250. doi:10.1109/ULTSYM.2004.1418287
 A. Suzuki, M. Kihara, Y. Katsumata, N. Kikuchi and J. Tsujino, “Configurations of Ultrasonic Motors Using Multiple Longitudinal Transducers,” IEEE Ultrasonics Symposium, Vol. 3, 23-27 August 2004, pp. 2267-2270. doi:10.1109/ULTSYM.2004.1418292
 Y. Ogahara and T. Maeno, “Torque Characteristics Analysis of a Traveling Wave Type Ultrasonic Motor Impressed High Load Torque in Low Speed Range,” IEEE International Ultrasonics, Ferroelectrics and Frequency Control Joint 50th Anniversary Conference, 2004, pp. 2271-2274.
 Y. Nakagawa, A. Saito and T. Maeno, “Transient Analysis of Bar-type Ultrasonic Motors,” Proceedings of 2004 IEEE/RSJ International Conference on Intelligent Robots and Systems, Vol. 2, 28 September-2 October 2004, pp. 1263-1268.
 O. Vyshnevskyy, S. Kovalev and J. Mehner, “Coupled Tangential-Axial Resonant Modes of Piezoelectric Hollow Cylinders and Their Application in Ultrasonic Motors,” IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 52, No. 1, 2005, pp.31-36. doi:10.1109/TUFFC.2005.1397348
 T. Kanda, Y. Oomori, A. Makino, K. Suzumori and A. Kobayashi, “Design and Testing of Rotors for A Cylindrical Micro-machined Micro Ultrasonic Motor,” IEEE Ultrasonics Symposium, San Diego, 29 October-2 November 2005, pp. 301-304. doi:10.1109/IROS.2007.4399205
 A. Kobayashi and T. Kanda, “Driving Performance of a Cylindrical Micro Ultrasonic Motor,” Proceedings of the 2007 IEEE/RSJ International Conference on Intelligent Robots and Systems, Vol. 1, San Diego, 29 October-2 November 2007, pp. 3809-3814.
 A. Saito, Y. Nakagawa and T. Maen, “Nonlinear Transient Response Analysis of Traveling-Wave Type Ultrasonic Motors,” Applications of Ferroelectrics, 17th IEEE International Symposium, Vol. 3, Santa Re, 23-28 February 2008, pp. 1-2.
 T. Ichihara and T. Kanda, “Design and Evaluation of Low-profile Micro Ultrasonic Motors using Sector Shaped Piezoelectric Vibrators,” 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems, Nice, 22-26 September 2008, pp. 588-593.