@conference{Wil03,
  title = "Using Graphic Turing Tests to Counter Automated DDoS Attacks Against Web Servers",
  author = "William G. Morein, Angelos Stavrou, Debra L. Cook, Angelos Keromytis, Vishal Misra, Dan Rubenstein",
  year = "2003",
  month = "oct",
  booktitle = "Proceedings of the 10th ACM International Conference on Computer and Communications Security (CCS)",
  address = "Washington D.C.",
}