Hierarchical Transformers for Multi-Document Summarization Yang Liu author Mirella Lapata author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication liu-lapata-2019-hierarchical 10.18653/v1/P19-1500 https://aclanthology.org/P19-1500/ 2019-07 5070 5081