No Permanent Friends or Enemies: Tracking Relationships between Nations from News Xiaochuang Han author Eunsol Choi author Chenhao Tan author 2019-06 text Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, Volume 1 (Long and Short Papers) Jill Burstein editor Christy Doran editor Thamar Solorio editor Association for Computational Linguistics Minneapolis, Minnesota conference publication han-etal-2019-permanent 10.18653/v1/N19-1167 https://aclanthology.org/N19-1167/ 2019-06 1660 1676