Shafik, M., B. Nyathi, and S. Fekkai. “An Innovative 3D Ultrasonic Actuator With Multidegree of Freedom for Machine Vision and Robot Guidance Industrial Applications Using A Single Vibration Ring Transducer”. International Journal of Engineering and Technology Innovation 3, no. 3 (July 1, 2013): 168–179. Accessed May 20, 2024. https://ojs.imeti.org/index.php/IJETI/article/view/108.