@inproceedings{sulem-etal-2021-know-dont,
    title = "Do We Know What We Don`t Know? Studying Unanswerable Questions beyond {SQ}u{AD} 2.0",
    author = "Sulem, Elior  and
      Hay, Jamaal  and
      Roth, Dan",
    editor = "Moens, Marie-Francine  and
      Huang, Xuanjing  and
      Specia, Lucia  and
      Yih, Scott Wen-tau",
    booktitle = "Findings of the Association for Computational Linguistics: EMNLP 2021",
    month = nov,
    year = "2021",
    address = "Punta Cana, Dominican Republic",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2021.findings-emnlp.385/",
    doi = "10.18653/v1/2021.findings-emnlp.385",
    pages = "4543--4548"
}