@inproceedings{ware2023causal,
  title={Causal necessity as a narrative planning step cost function},
  author={Ware, Stephen G. and Senanayake, Lasantha and Farrell, Rachelyn},
  booktitle={Proceedings of the 19th AAAI conference on Artificial Intelligence and Interactive Digital Entertainment},
  year={2023},
  pages={155--164}
}