Collision-free path planning for a robot with two arms cooperating in the 3-D work space. - C. S. Zhao; M. Farooq; M. M. Bayoumi (ICRA, 1996)

Starting Characteristic Testing and Analysis of Ultrasonic Motor Based on Wavelet Transformation. - S. L. Shen; C. S. Zhao (WAA, 2003)