@misc{indiciaedb62042afafe,
  title = {The concentric-ring sign revisited.},
  author = {E S Siegelman and E K Outwater},
  year = {1996},
  doi = {10.2214/ajr.166.6.8633472},
  url = {https://pubmed.ncbi.nlm.nih.gov/8633472/},
  note = {Source identifier: 8633472}
}