@misc{indiciae08a6b3f6ed53,
  title = {Colorimetry by a new principle.},
  author = {R D Gunkel and D G Cogan},
  year = {1978},
  doi = {10.1001/archopht.1978.03910050193016},
  url = {https://pubmed.ncbi.nlm.nih.gov/305241/},
  note = {Source identifier: 305241}
}