J. Lee, R. Rossi, and X. Kong. Proceedings of the 24th ACM SIGKDD International Conference on Knowledge Discovery & Data Mining, page 1666--1674. ACM, (2018)
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)
B. Dorow, and D. Widdows. Proceedings of the 10th conference on European chapter of the Association
for Computational Linguistics, volume 2 of EACL '03, page 79--82. Morristown, NJ, USA, Association for Computational Linguistics, (2003)