@inproceedings{ni-etal-2019-learning,
    title = "Learning to Attend On Essential Terms: An Enhanced Retriever-Reader Model for Open-domain Question Answering",
    author = "Ni, Jianmo  and
      Zhu, Chenguang  and
      Chen, Weizhu  and
      McAuley, Julian",
    editor = "Burstein, Jill  and
      Doran, Christy  and
      Solorio, Thamar",
    booktitle = "Proceedings of the 2019 Conference of the North {A}merican Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long and Short Papers)",
    month = jun,
    year = "2019",
    address = "Minneapolis, Minnesota",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/N19-1030/",
    doi = "10.18653/v1/N19-1030",
    pages = "335--344"
}