WASET
    T. Arudchelvam and  W. W. E. N. Fernando,  Maintaining User-Level Security in Short Message Service.   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 114(6). 1121 - 1124
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10004660.