Improving Tree-to-Tree Translation with Packed Forests Yang Liu author Yajuan author Qun Liu author 2009-08 text 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 Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication liu-etal-2009-improving https://aclanthology.org/P09-1063/ 2009-08 558 566