@misc{indiciaee73698946e2c,
  title = {Solid-state masers without inversion: Theoretical prediction for high-efficiency oscillators or phase-sensitive detectors.},
  author = {FF Popescu},
  year = {1993},
  doi = {10.1103/physrevb.48.13569},
  url = {https://pubmed.ncbi.nlm.nih.gov/10007755/},
  note = {Source identifier: 10007755}
}