WASET
    H. P. Singh and  S. Singh,  Computationally Efficient Signal Quality Improvement Method for VoIP System.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2012, vol. 71(11). 1345 - 1350
    [viewed 05 May 2024]. Available from: https://publications.waset.org/pdf/6730.