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Changmeng Zheng, Yi Cai, Jingyun Xu, Ho-fung Leung, Guandong Xu. Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP). 2019.
Zheng et al. (Tue,) studied this question.