@misc{indiciae93f948472b83,
  title = {Nonclassical light from a semiconductor laser operating at 4 K.},
  author = {WH Richardson and RM Shelby},
  year = {1990},
  doi = {10.1103/physrevlett.64.400},
  url = {https://pubmed.ncbi.nlm.nih.gov/10041970/},
  note = {Source identifier: 10041970}
}