At Which Level Should We Extract? An Empirical Analysis on Extractive Document Summarization Qingyu Zhou author Furu Wei author Ming Zhou author 2020-12 text Proceedings of the 28th International Conference on Computational Linguistics Donia Scott editor Nuria Bel editor Chengqing Zong editor International Committee on Computational Linguistics Barcelona, Spain (Online) conference publication zhou-etal-2020-level 10.18653/v1/2020.coling-main.492 https://aclanthology.org/2020.coling-main.492/ 2020-12 5617 5628