@misc{indiciaeeb61ec0f65d6,
  title = {Ultranarrow nonlinear optical resonances in solids.},
  author = {DG Steel and SC Rand},
  year = {1985},
  doi = {10.1103/physrevlett.55.2285},
  url = {https://pubmed.ncbi.nlm.nih.gov/10032101/},
  note = {Source identifier: 10032101}
}