Referential Cohesion A Challenge for Machine Translation Evaluation Christian Hardmeier author 2020-12 text Proceedings of the Second International Workshop of Discourse Processing Qun Liu editor Deyi Xiong editor Shili Ge editor Xiaojun Zhang editor Association for Computational Linguistics Suzhou, China conference publication hardmeier-2020-referential 10.18653/v1/2020.iwdp-1.10 https://aclanthology.org/2020.iwdp-1.10/ 2020-12 54