@misc{indiciae0b0c621777c3,
  title = {Practical gamma camera quality control with a four-point phantom.},
  author = {J L Lancaster and D T Kopp and J S Lasher and R Blumhardt},
  year = {1985},
  url = {https://pubmed.ncbi.nlm.nih.gov/3973741/},
  note = {Source identifier: 3973741}
}