Meng Cao 0003 Yue Dong 0002 Jackie Chi Kit Cheung Hallucinated but Factual! Inspecting the Factuality of Hallucinations in Abstractive Summarization. 3340-3354 2022 ACL (1) https://doi.org/10.18653/v1/2022.acl-long.236 https://aclanthology.org/2022.acl-long.236 conf/acl/2022-1 db/conf/acl/acl2022-1.html#CaoDC22