@misc{indiciae5009b08a5cba,
  title = {Micromaser spectrum: Trapped states.},
  author = {N Lu},
  year = {1993},
  doi = {10.1103/physreva.47.1347},
  url = {https://pubmed.ncbi.nlm.nih.gov/9909060/},
  note = {Source identifier: 9909060}
}