L. Lee, Y. Juan, K. Lee, W. Tseng, H. Chen, and Y. Tseng. Proceedings of the 2012 ACM conference on Computer and communications security, page 992--994. New York, NY, USA, ACM, (2012)
S. Chen. Proceedings of the 31st Annual Conference of the Association for Computational Linguistics, page 9--16. Columbus, Ohio, Association for Computational Linguistics, Association for Computational Linguistics, (1993)