@article{wang13tdsc, author = {Wang, L. and Jajodia, S. and Singhal, A. and Cheng, P. and Noel, S.}, title = {k-Zero day safety: A network security metric for measuring the risk of unknown vulnerabilities}, journal ={IEEE Transactions on Dependable and Secure Computing}, volume = {11}, number = {1}, year = {2013}, pages = {30-44}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }