@misc{indiciae21d2bc40a27e,
  title = {A device for measuring free-way space.},
  author = {M R Dyer},
  year = {1971},
  doi = {10.1038/sj.bdj.4802668},
  url = {https://pubmed.ncbi.nlm.nih.gov/5280441/},
  note = {Source identifier: 5280441}
}