@misc{indiciae46d3a07d79ec,
  title = {Nonclassical states: An observable criterion},
  author = {W Vogel},
  year = {2000},
  doi = {10.1103/physrevlett.84.1849},
  url = {https://pubmed.ncbi.nlm.nih.gov/11017643/},
  note = {Source identifier: 11017643}
}