@article{PhysRevA.89.032109,
  title = {Value-indefinite observables are almost everywhere},
  author = {Alastair A. Abbott and Cristian S. Calude and Karl Svozil},
  journal = {Physical Review A},
  volume = {89},
  issue = {3},
  pages = {032109},
  numpages = {7},
  year = {2014},
  month = {Mar},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevA.89.032109},
  url = {http://dx.doi.org/10.1103/PhysRevA.89.032109},
  eprint = {arXiv:1309.7188}
}