@Inproceedings{EPTCS287.7,
  author    = {Genovese, Fabrizio and Herold, Jelle},
  year      = {2019},
  title     = {Executions in (Semi-)Integer Petri Nets are Compact Closed Categories},
  editor    = {Selinger, Peter and Chiribella, Giulio},
  booktitle = {{\rm Proceedings of the 15th International Conference on}
               Quantum Physics and Logic,
               {\rm Halifax, Canada, 3-7th June 2018}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {287},
  publisher = {Open Publishing Association},
  pages     = {127-144},
  doi       = {10.4204/EPTCS.287.7},
}