I. Szpektor, and I. Dagan. COLING '08: Proceedings of the 22nd International Conference on Computational Linguistics, page 849--856. Morristown, NJ, USA, Association for Computational Linguistics, (2008)
S. Scott, and S. Matwin. ICML '99: Proceedings of the Sixteenth International Conference on Machine Learning, page 379--388. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (1999)