@misc{indiciae7097e4b14e9d,
  title = {Acquired posterior keratoconus.},
  author = {R Williams},
  year = {1987},
  doi = {10.1136/bjo.71.1.16},
  url = {https://pubmed.ncbi.nlm.nih.gov/3814563/},
  note = {Source identifier: 3814563}
}