Chiang, Ting-Rui, Hao-Tong Ye, and Yun-Nung Chen. “An Empirical Study of Content Understanding in Conversational Question Answering”. Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 05 (April 3, 2020): 7578-7585. Accessed April 16, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/6257.