Ákos Pintér and  István Dénes,  Stability Issues on an Implemented All-Pass Filter Circuitry.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2012, vol. 63(3). 323 - 329
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3582.