@misc{indiciaec77132112eb3,
  title = {Quantitative proton tomography: preliminary experiments.},
  author = {A M Cormack and A M Koehler},
  year = {1976},
  doi = {10.1088/0031-9155/21/4/007},
  url = {https://pubmed.ncbi.nlm.nih.gov/972921/},
  note = {Source identifier: 972921}
}