S. Ghosh, G. Korlam, and N. Ganguly. Proceedings of the 20th international conference companion on World wide web, page 41--42. New York, NY, USA, ACM, (2011)
C. Grier, K. Thomas, V. Paxson, and M. Zhang. Proceedings of the 17th ACM conference on Computer and communications security, page 27--37. New York, NY, USA, ACM, (2010)