@misc{indiciae216084b26e18,
  title = {Errors generated with the use of rectangular collimation.},
  author = {E T Parks},
  year = {1991},
  doi = {10.1016/0030-4220(91)90442-f},
  url = {https://pubmed.ncbi.nlm.nih.gov/2052340/},
  note = {Source identifier: 2052340}
}