Effects of Empty Categories on Machine Translation Tagyoung Chung author Daniel Gildea author 2010-10 text Proceedings of the 2010 Conference on Empirical Methods in Natural Language Processing Hang Li editor Lluís Màrquez editor Association for Computational Linguistics Cambridge, MA conference publication chung-gildea-2010-effects https://aclanthology.org/D10-1062/ 2010-10 636 645