@misc{indiciaeaddee6fa8ed3,
  title = {Color Changes in Elasmobranchs.},
  author = {G H Parker},
  year = {1936},
  doi = {10.1073/pnas.22.1.55},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588046/},
  note = {Source identifier: 16588046}
}