Do Multi-Document Summarization Models Synthesize? Jay DeYoung author Stephanie C Martinez author Iain J Marshall author Byron C Wallace author 2024 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal deyoung-etal-2024-multi 10.1162/tacl_a_00687 https://aclanthology.org/2024.tacl-1.58/ 2024 12 1043 1062