@misc{indiciaede1000a30a3d,
  title = {Gonioscopy and artefacts.},
  author = {K E Schirmer},
  year = {1967},
  doi = {10.1136/bjo.51.1.50},
  url = {https://pubmed.ncbi.nlm.nih.gov/6018550/},
  note = {Source identifier: 6018550}
}