@misc{indiciaeca15c1f2e569,
  title = {A guard lens for the refractor.},
  author = {R H WHITTEN},
  year = {1951},
  doi = {10.1016/0002-9394(51)90698-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/14857114/},
  note = {Source identifier: 14857114}
}