H. Xiao, M. Huang, and X. Zhu. Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), 1, page 2316--2325. (2016)
D. Dimitrov, P. Singer, F. Lemmerich, and M. Strohmaier. Proceedings of the 26th International Conference on World Wide Web, page 917--926. International World Wide Web Conferences Steering Committee, (2017)