@misc{indiciae4c8cf4ed55c6,
  title = {Effective focal spot size.},
  author = {G U Rao},
  doi = {10.1097/00004424-197207000-00026},
  url = {https://pubmed.ncbi.nlm.nih.gov/5070799/},
  note = {Source identifier: 5070799}
}