@misc{indiciae6eb5b32fd7d2,
  title = {A simple isocenter checking procedure for radiotherapy treatment machines using the optical pointer.},
  author = {F R Hudson},
  doi = {10.1118/1.596159},
  url = {https://pubmed.ncbi.nlm.nih.gov/3127664/},
  note = {Source identifier: 3127664}
}