Tsai M.-S.Lee C.-H.Hwang S.-H.2019-07-042019-07-0420038853010https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037608969&doi=10.1109%2fTUFFC.2003.1193618&partnerID=40&md5=ac992ac184961f225462c0b9574c68b7https://scholars.lib.ntu.edu.tw/handle/123456789/412723Dynamic modeling and analysis of a bimodal ultrasonic motorjournal article10.1109/TUFFC.2003.11936182-s2.0-0037608969