WASET
    Toshihiko Takemura and  Makoto Osajima and  Masatoshi Kawano,  Positive Analysis on Vulnerability, Information Security Incidents, and the Countermeasures of Japanese Internet Service Providers.   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 1163 - 1170
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3822.