1. Piezoelectric motors are currently advertised at following web pages. Available from: , , , , .
2. P. Vasiljev, S. Borodinas, D. Mazeika, G. Kulvietis, S.-J. Yoon, Investigation of the multipurpose piezoelectric actuator. In: Proceedings of the 2nd International Workshop on Piezoelectric Materials and their Application in Actuators, HNI Verlagsschriftenreihe, Band 180, ISBN 3-935433-89-1, pp. 399–408.
3. S. Niwano, C. Yun, J. Friend, K. Nakamura, S. Ueha, T. Hirahara, An active dummy head driven by a multi-degree-of-freedom ultrasonic actuator. In: Proceedings of World Congress Ultrasonics 2003, pp. 1597–1600.
4. T. Hemsel, Untersuchung und Weiterentwicklung linearer piezoelektrischer Schwingungsantriebe. Dissertation, HNI-Verlagsschriftenreihe, Bd. 101, 2001.
5. W. Wischnewskiy, S. Kovalev, O. Vyshnevskyy, New ultrasonic piezoelectric actuator for nanopositioning. In: Proceedings of Actuator 2004, pp. 118–122.