@misc{indiciaeded4eb5afbb1,
  title = {Inversionless amplification in a multilevel system.},
  author = {P Mandel and O Kocharovskaya},
  year = {1993},
  doi = {10.1103/physreva.47.5003},
  url = {https://pubmed.ncbi.nlm.nih.gov/9909533/},
  note = {Source identifier: 9909533}
}