@misc{indiciae417924bea5c6,
  title = {Portable perimeter.},
  author = {C M RUBEN},
  year = {1951},
  doi = {10.1136/bjo.35.10.634},
  url = {https://pubmed.ncbi.nlm.nih.gov/14886557/},
  note = {Source identifier: 14886557}
}