Driss Guerchi and  Fatiha Djebbar,  Narrowband Speech Hiding using Vector Quantization.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 1120 - 1123
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/12059.