@Inproceedings{EPTCS171.12,
  author    = {Roumen, Frank},
  year      = {2014},
  title     = {Categorical characterizations of operator-valued measures},
  editor    = {Coecke, Bob and Hoban, Matty},
  booktitle = {{\rm Proceedings of the 10th International Workshop on}
               Quantum Physics and Logic,
               {\rm Castelldefels (Barcelona), Spain, 17th to 19th July 2013}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {171},
  publisher = {Open Publishing Association},
  pages     = {132-144},
  doi       = {10.4204/EPTCS.171.12},
}