@misc{indiciaeff799fc2a595,
  title = {Radiological subtraction by colour addition.},
  author = {B F Vaughan},
  year = {1968},
  doi = {10.1111/j.1440-1673.1968.tb03365.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5662536/},
  note = {Source identifier: 5662536}
}