@misc{indiciaeb18391d31411,
  title = {Letter: Minimizing surface dose with medium Z electron shields.},
  author = {J W Baum and L F Phillips},
  year = {1974},
  doi = {10.1088/0031-9155/19/2/012},
  url = {https://pubmed.ncbi.nlm.nih.gov/4445206/},
  note = {Source identifier: 4445206}
}