@misc{indiciae5bba1c59e802,
  title = {The normal cup-disk ratio.},
  author = {E F Carpel and P F Engstrom},
  year = {1981},
  doi = {10.1016/0002-9394(81)90056-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/7234939/},
  note = {Source identifier: 7234939}
}