@misc{indiciaee036a31ff81e,
  title = {Spectral lines as frequency standards.},
  author = {H LYONS},
  year = {1952},
  doi = {10.1111/j.1749-6632.1952.tb26600.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/13139168/},
  note = {Source identifier: 13139168}
}