R. Varalakshmi,  Bit Model Based Key Management Scheme for Secure Group Communication.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2015, vol. 105(9). 2107 - 2111
    [viewed 23 September 2020]. Available from: https://publications.waset.org/pdf/10003002.