Factored Translation Models Philipp Koehn author Hieu Hoang author 2007-06 text Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning (EMNLP-CoNLL) Jason Eisner editor Association for Computational Linguistics Prague, Czech Republic conference publication koehn-hoang-2007-factored https://aclanthology.org/D07-1091/ 2007-06 868 876