@Inproceedings{EPTCS318.12,
  author    = {Gheorghiu, Alexandru and Heunen, Chris},
  year      = {2020},
  title     = {Ontological models for quantum theory as functors},
  editor    = {Coecke, Bob and Leifer, Matthew},
  booktitle = {{\rm Proceedings 16th International Conference on}
               Quantum Physics and Logic,
               {\rm Chapman University, Orange, CA, USA., 10-14 June 2019}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {318},
  publisher = {Open Publishing Association},
  pages     = {196-212},
  doi       = {10.4204/EPTCS.318.12},
}