@article{causalinferencebystringdiagramsurgery,
  title = {Causal Inference by String Diagram Surgery},
  author = {Bart Jacobs and Aleks Kissinger and Fabio Zanasi},
  year = {2018},
  eprint = {1811.08338},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1811.08338v2},
}