Some DDoS related papers/pointers
J. Jung, V. Paxson, A. Berger, and H. Balakrishnan,
Fast Portscan Detection Using Sequential Hypothesis Testing
, Proc. IEEE Symposium on Security and Privacy, May 2004.
3rd Workshop on Rapid Malcode (WORM 2005)
WORM 2004
WORM 2003