@misc{indiciae0e680350a197,
  title = {Observer variation in ophthalmology.},
  author = {R A Gibson and H F Sanderson},
  year = {1980},
  doi = {10.1136/bjo.64.6.457},
  url = {https://pubmed.ncbi.nlm.nih.gov/7387972/},
  note = {Source identifier: 7387972}
}