@misc{indiciae25f251d3c5a9,
  title = {The sigmoid elevator sign: it significance.},
  author = {S Rubin and R Lambie and K C Davidson and E M Herman},
  year = {1969},
  doi = {10.1148/93.4.867},
  url = {https://pubmed.ncbi.nlm.nih.gov/5824243/},
  note = {Source identifier: 5824243}
}