AmbiFC: Fact-Checking Ambiguous Claims with Evidence Max Glockner author Ieva Staliūnaitė author James Thorne author Gisela Vallejo author Andreas Vlachos author Iryna Gurevych author 2024 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal glockner-etal-2024-ambifc 10.1162/tacl_a_00629 https://aclanthology.org/2024.tacl-1.1/ 2024 12 1 18