@article{4738,
  author = {John Bohn},
  title = {Observable Characteristics of Pure Quantum States},
  year = {1991},
  journal = {Physical Review Letters},
  volume = {66},
  pages = {1547},
  month = {1991-03},
  url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.66.1547},
}