@inproceedings{han-etal-2019-permanent,
    title = "No Permanent {F}riends or Enemies: Tracking Relationships between Nations from News",
    author = "Han, Xiaochuang  and
      Choi, Eunsol  and
      Tan, Chenhao",
    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://preview.aclanthology.org/jlcl-multiple-ingestion/N19-1167/",
    doi = "10.18653/v1/N19-1167",
    pages = "1660--1676"
}