Z. Dai, Z. Yang, Y. Yang, J. Carbonell, Q. Le, and R. Salakhutdinov. Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics, page 2978--2988. Florence, Italy, Association for Computational Linguistics, (July 2019)
G. Kobayashi, T. Kuribayashi, S. Yokoi, and K. Inui. Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP), page 7057--7075. Online, Association for Computational Linguistics, (November 2020)
Y. Chai, S. Jin, and X. Hou. Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics, page 6887--6900. Online, Association for Computational Linguistics, (July 2020)