@inproceedings{Coecke2008zxcalculus,
  author = {Coecke, Bob and Duncan, Ross},
  editor = {Aceto, Luca and others},
  publisher = {Springer Berlin Heidelberg},
  address = {Berlin, Heidelberg},
  booktitle = {Automata, Languages and Programming},
  isbn = {978-3-540-70583-3},
  pages = {298--310},
  title = {Interacting Quantum Observables},
  year = {2008},
}