@misc{indiciaecdd896c0f2d1,
  title = {A light analog system for radiotherapy planning.},
  author = {G S Freedman and P N Goodwin},
  year = {1969},
  doi = {10.2214/ajr.105.3.648},
  url = {https://pubmed.ncbi.nlm.nih.gov/4180247/},
  note = {Source identifier: 4180247}
}