1. Ultrasonic Motors: Theory and Applications;Ueha,1993
2. Ultrasonic Motors Technologies and Applications;Zhao,2007
3. Ultrasonic motor;Yukihiro;J. Acoust. Soc. Jpn.,1987
4. J. Zumeris, Ceramic Motor, U.S. Patent 5453653, 1995.
5. Transducer for high speed and large thrust ultrasonic linear motor using two sandwich type vibrators;Kurosawa;IEEE Trans. Ultrason. Ferroelectr. Freq. Control,1998