R. Kabila,  Network Based Intrusion Detection and Prevention Systems in IP-Level Security Protocols.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 1152 - 1158
    [viewed 27 January 2020]. Available from: https://publications.waset.org/pdf/14713.