@inproceedings{challengesofaddingcausationtoricher,
  title = {Challenges of Adding Causation to Richer Event Descriptions},
  author = {Rei Ikuta and Will Styler and Mariah Hamang and Tim O{'}Gorman and Martha Palmer},
  year = {2014},
  booktitle = {WS 2014 6},
  url = {https://aclanthology.org/W14-2903},
}