@misc{indiciae2878a72abd51,
  title = {Use of the operating microscope. Adjustment and compensation for refractive errors.},
  author = {T N Steffen and J C Urban},
  year = {1969},
  doi = {10.1001/archotol.1969.00770030382022},
  url = {https://pubmed.ncbi.nlm.nih.gov/5803672/},
  note = {Source identifier: 5803672}
}