1. WebSOS: An Overlay-based System For Protecting Web Servers From Denial of Service Attacks Stavrou, Angelos; Cook, Debra L.; Morein, William G.; Keromytis, Angelos D.; Misra, Vishal; Rubenstein, Daniel Stuart 2005 Articles Computer science
2. Using Graphic Turing Tests To Counter Automated DDoS Attacks Against Web Servers Morein, William G.; Stavrou, Angelos; Cook, Debra L.; Keromytis, Angelos D.; Misra, Vishal; Rubenstein, Daniel Stuart 2003 Articles Computer science
3. WebSOS: Protecting Web Servers From DDoS Attacks Cook, Debra L.; Morein, William G.; Keromytis, Angelos D.; Misra, Vishal; Rubenstein, Daniel Stuart 2003 Articles Computer science