@misc{indiciae3742d1ca89f5,
  title = {[Keratoconus concurrent in identical twins].},
  author = {W Hammerstein},
  year = {1972},
  doi = {10.1159/000308537},
  url = {https://pubmed.ncbi.nlm.nih.gov/4680209/},
  note = {Source identifier: 4680209}
}