Document Summarization with Latent Queries Yumo Xu author Mirella Lapata author 2022 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal xu-lapata-2022-document 10.1162/tacl_a_00480 https://aclanthology.org/2022.tacl-1.36/ 2022 10 623 638