Chen, Chin-Ling, and Chih-Yu Chang. “A Two-Tier Coordination System Against DDoS Attacks”. International Journal of Online and Biomedical Engineering (iJOE) 9, no. 4 (July 23, 2013): pp. 15–21. Accessed November 21, 2024. https://online-journals.org/index.php/i-joe/article/view/2820.