@misc{indiciae606a6fe45ac1,
  title = {Electronic flicker apparatus with automatic frequency variation.},
  author = {C BERGER and A MAHNEKE and O MORTENSEN},
  year = {1955},
  doi = {10.1364/josa.45.000307},
  url = {https://pubmed.ncbi.nlm.nih.gov/14368414/},
  note = {Source identifier: 14368414}
}