From Key Points to Key Point Hierarchy: Structured and Expressive Opinion Summarization Arie Cattan author Lilach Eden author Yoav Kantor author Roy Bar-Haim author 2023-07 text Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication cattan-etal-2023-key 10.18653/v1/2023.acl-long.52 https://aclanthology.org/2023.acl-long.52/ 2023-07 912 928