@inproceedings{asai-choi-2021-challenges,
    title = "Challenges in Information-Seeking {QA}: Unanswerable Questions and Paragraph Retrieval",
    author = "Asai, Akari  and
      Choi, Eunsol",
    editor = "Zong, Chengqing  and
      Xia, Fei  and
      Li, Wenjie  and
      Navigli, Roberto",
    booktitle = "Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)",
    month = aug,
    year = "2021",
    address = "Online",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/2021.acl-long.118/",
    doi = "10.18653/v1/2021.acl-long.118",
    pages = "1492--1504"
}