@misc{indiciae8de551195226,
  title = {Measurement of a photon penumbra-generating kernel for a convolution-adapted ratio-TAR algorithm for 3D treatment planning.},
  author = {D A Low and X R Zhu and W B Harms and J A Purdy},
  year = {1995},
  doi = {10.1118/1.597621},
  url = {https://pubmed.ncbi.nlm.nih.gov/8531864/},
  note = {Source identifier: 8531864}
}