@inproceedings{fillingknowledgebasegapsfordistant,
  title = {Filling Knowledge Base Gaps for Distant Supervision of Relation Extraction},
  author = {Wei Xu and Raphael Hoffmann and Le Zhao and Ralph Grishman},
  year = {2013},
  booktitle = {ACL 2013 8},
  url = {https://aclanthology.org/P13-2117},
}