@inproceedings{zhang-etal-2026-towards-reliable,
    title = "Towards Reliable Long-Context Reasoning: Detecting Unanswerable Questions via {F}act{G}uard",
    author = "Zhang, Qian-Wen  and
      Liu, Biao  and
      Li, Fang  and
      Wang, Jie  and
      Qiao, Lingfeng  and
      Yu, Yifei  and
      Yin, di  and
      Sun, Xing",
    editor = "Lee, Hung-Yi  and
      Dev, Sunipa  and
      Li, Jessy  and
      Elliott, Desmond",
    booktitle = "Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing",
    month = oct,
    year = "2026",
    address = "Budapest, Hungary",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2026.emnlp-main.1888/",
    doi = "10.18653/2026.emnlp-main.1888",
    pages = "43026--43045",
    ISBN = "979-8-89176-459-0"
}