@misc{indiciaef89292871569,
  title = {Radiation barriers.},
  author = {A G Richards},
  year = {1968},
  doi = {10.1016/0030-4220(68)90038-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/5239092/},
  note = {Source identifier: 5239092}
}