K. Parton, K. McKeown, B. Coyne, M. Diab, R. Grishman, D. Hakkani-Tür, M. Harper, H. Ji, W. Ma, A. Meyers and 5 other author(s). Proceedings of the Joint Conference of the 47th Annual Meeting of the ACL and the 4th International Joint Conference on Natural Language Processing of the AFNLP, page 423--431. Suntec, Singapore, Association for Computational Linguistics, (August 2009)