@InProceedings{aarnes06:markov,
  author = {A. AArnes and F. Valeur and G. Vigna and R.A. Kemmerer},
  title = {{Using Hidden Markov Models to Evaluate the Risk of Intrusions}},
  booktitle = {Proceedings of the $9^{th}$ Symposium on Recent Advances in Intrusion Detection (RAID)},
  year = {2006},
  month = {September},
  address = {Hamburg, Germany},
  publisher = {Springer Verlag}
}