@misc{indiciaec20c9628c8e5,
  title = {Checking diagnostic x-ray beam quality.},
  author = {G M Ardran and H E Crooks},
  year = {1968},
  doi = {10.1259/0007-1285-41-483-193},
  url = {https://pubmed.ncbi.nlm.nih.gov/5641959/},
  note = {Source identifier: 5641959}
}