HEGEL: Hypergraph Transformer for Long Document Summarization Haopeng Zhang author Xiao Liu author Jiawei Zhang author 2022-12 text Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication zhang-etal-2022-hegel 10.18653/v1/2022.emnlp-main.692 https://aclanthology.org/2022.emnlp-main.692/ 2022-12 10167 10176