WASET
    D. Sun and  T. F. Lu and  A. Zander and  M. Trinkle,  Near Field Focusing Behaviour of Airborne Ultrasonic Phased Arrays Influenced by Airflows.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 113(5). 835 - 841
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10004271.