@misc{indiciae7af6cce0c288,
  title = {A time-marking device for serial radiographs.},
  author = {S Klevenhagen and R B Pridie},
  year = {1967},
  doi = {10.1259/0007-1285-40-474-470},
  url = {https://pubmed.ncbi.nlm.nih.gov/6026462/},
  note = {Source identifier: 6026462}
}