WASET
    Yasunori Sugita and  Toshinori Yoshikawa,  Design of Stable IIR Digital Filters with Specified Group Delay Errors.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 77 - 82
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/7489.