@misc{indiciae12208e85790b,
  title = {Exogenous ochronosis: an epidemiological study.},
  author = {N Hardwick and L W Van Gelder and C A Van der Merwe and M P Van der Merwe},
  year = {1989},
  doi = {10.1111/j.1365-2133.1989.tb07787.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2923796/},
  note = {Source identifier: 2923796}
}