M. Zhang, J. Zhang, J. Su, and G. Zhou. Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the Association for Computational Linguistics, page 825--832. Stroudsburg, PA, USA, Association for Computational Linguistics, (2006)
M. Collins, and N. Duffy. Advances in Neural Information Processing Systems 14 --- Proceedings of the 2001 Neural Information Processing Systems Conference (NIPS 2001), December 3-8, 2001, Vancouver, British Columbia, Canada, page 625--632. MIT Press, Cambridge, MA, USA, (2002)