WASET
    Nael Hirzalla,  Independent Encryption Technique for Mobile Voice Calls.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 103(7). 1680 - 1684
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10001839.