@misc{indiciae01fb9d2c30d7,
  title = {Calculating output factors for photon beam radiotherapy using a convolution/superposition method based on a dual source photon beam model.},
  author = {H H Liu and T R Mackie and E C McCullough},
  year = {1997},
  doi = {10.1118/1.598111},
  url = {https://pubmed.ncbi.nlm.nih.gov/9434980/},
  note = {Source identifier: 9434980}
}