TY  - RPRT
TI  - The concentric-ring sign revisited.
AU  - E S Siegelman
AU  - E K Outwater
PY  - 1996
DO  - 10.2214/ajr.166.6.8633472
UR  - https://pubmed.ncbi.nlm.nih.gov/8633472/
ID  - 8633472
ER  -