@misc{indiciaeae616d92ba60,
  title = {Quantum limits to light amplifiers.},
  author = {MJ Collett and DF Walls},
  year = {1988},
  doi = {10.1103/physrevlett.61.2442},
  url = {https://pubmed.ncbi.nlm.nih.gov/10039119/},
  note = {Source identifier: 10039119}
}