@misc{indiciae83d4405bfa38,
  title = {Photographing a flame by spatial frequency modulation.},
  author = {R Bernard and J C Gacon},
  year = {1970},
  doi = {10.1038/226447a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16057315/},
  note = {Source identifier: 16057315}
}