1. Ultrasonic micromotors;Moroney,1989
2. Characteristics of ultrasonic motors driven in a vacuum;Ishii;Jpn. J. Appl. Phys., Part 1: Regular Papers & Short Notes & Review Papers,1998
3. Operation of ultrasonic motor in ultrahigh vacuum condition;Toshiki,2003
4. Influence of a high vacuum on the precise positioning using an ultrasonic linear motor;Kim;Rev. Sci. Instrum.,2011
5. Ultra-sonic motor for the actuators of space optical communications terminal;Araki,2017