@misc{indiciae84a9e51f538c,
  title = {Lambda -type lasers and masers: Lasing without inversion and a vector model.},
  author = {N Lu},
  year = {1992},
  doi = {10.1103/physreva.45.5011},
  url = {https://pubmed.ncbi.nlm.nih.gov/9907585/},
  note = {Source identifier: 9907585}
}