Loosely Tree-Based Alignment for Machine Translation Daniel Gildea author 2003-07 text Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Sapporo, Japan conference publication gildea-2003-loosely 10.3115/1075096.1075107 https://aclanthology.org/P03-1011/ 2003-07 80 87