@inproceedings{wang10esorics,
 author = {Wang, Lingyu and Jajodia, Sushil and Singhal, Anoop and Noel, Steven},
 title = {k-Zero day safety: Measuring the security risk of networks against unknown attacks},
 booktitle = {Proceedings of the 15th European Symposium on Research in Computer Security (ESORICS'10) },
 year = {2010},
 pages = {573-587},
 }