A. Benton, and M. Dredze. Proceedings of the 2018 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long Papers), 1, page 365--374. (2018)
A. Rooshenas, A. Kamath, and A. McCallum. Proceedings of the 2018 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 2 (Short Papers), 2, page 130--135. (2018)