@misc{indiciae076bc417989a,
  title = {Ophthalmoscope densitometer.},
  author = {J Marshall and D A Palmer},
  year = {1971},
  doi = {10.1136/bjo.55.8.572},
  url = {https://pubmed.ncbi.nlm.nih.gov/5564713/},
  note = {Source identifier: 5564713}
}