@misc{indiciaea94f24c859ca,
  title = {Amplification without inversion: The double- Lambda scheme.},
  author = {O Kocharovskaya and P Mandel},
  year = {1990},
  doi = {10.1103/physreva.42.523},
  url = {https://pubmed.ncbi.nlm.nih.gov/9903830/},
  note = {Source identifier: 9903830}
}