@misc{indiciaee2d3c036b2ac,
  title = {New photokeratoscope utilizing a hemispherical object surface.},
  author = {H A KNOLL and R STIMSON and C L WEEKS},
  year = {1957},
  doi = {10.1364/josa.47.000221},
  url = {https://pubmed.ncbi.nlm.nih.gov/13406658/},
  note = {Source identifier: 13406658}
}