@inproceedings{shirvani2017possible,
  title={A possible worlds model of belief for state-space narrative planning},
  author={Shirvani, Alireza and Ware, Stephen G. and Farrell, Rachelyn},
  booktitle={Proceedings of the 13th AAAI international conference on Artificial Intelligence and Interactive Digital Entertainment},
  pages={101--107},
  year={2017}
}