Machine Translation System Combination by Confusion Forest Taro Watanabe author Eiichiro Sumita author 2011-06 text Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies Dekang Lin editor Yuji Matsumoto editor Rada Mihalcea editor Association for Computational Linguistics Portland, Oregon, USA conference publication watanabe-sumita-2011-machine https://aclanthology.org/P11-1125/ 2011-06 1249 1257