WASET
    Shiang-Hwua Yu and  Po-Hsun Wu,  Two Kinds of Self-Oscillating Circuits Mechanically Demonstrated.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 91(7). 1334 - 1338
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10000983.