@misc{indiciaecfbf65b64b15,
  title = {A passive treatment verification device.},
  author = {E Van Roosenbeek and T G Nelson},
  year = {1971},
  doi = {10.2214/ajr.111.3.625},
  url = {https://pubmed.ncbi.nlm.nih.gov/4994158/},
  note = {Source identifier: 4994158}
}