Jia, R., Cao, Y., Shi, H., Fang, F., Yin, P. and Wang, S. 2021. Flexible Non-Autoregressive Extractive Summarization with Threshold: How to Extract a Non-Fixed Number of Summary Sentences. Proceedings of the AAAI Conference on Artificial Intelligence. 35, 14 (May 2021), 13134-13142. DOI:https://doi.org/10.1609/aaai.v35i14.17552.