@inproceedings{AC,
  title = "A categorical semantics of quantum protocols",
  author = "Samson Abramsky and Bob Coecke",
  year = "2004",
  booktitle = "Proceedings of the 19th Annual IEEE Symposium of Logic in Computer Science",
  note = "Extended version: arXiv:0808.1023",
  pages = "415-425",
  publisher = "IEEE Computer Science Press",
}