@misc{indiciaeb75a75b54f69,
  title = {Subtraction radiography: techniques and limitations.},
  author = {M G Ort and E C Gregg and B Kaufman},
  year = {1977},
  doi = {10.1148/124.1.65},
  url = {https://pubmed.ncbi.nlm.nih.gov/325600/},
  note = {Source identifier: 325600}
}