@misc{indiciaeaa2aeaf34b70,
  title = {Calibration errors in digital subtraction radiography.},
  author = {R L Webber and U E Ruttimann and T J Heaven},
  year = {1990},
  doi = {10.1111/j.1600-0765.1990.tb00915.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2145412/},
  note = {Source identifier: 2145412}
}