@misc{indiciaedd0509c88f80,
  title = {The collar button ulcer. A radiologic-pathologic correlation.},
  author = {J E Lichtenstein and J E Madewell and D S Feigin},
  year = {1979},
  doi = {10.1007/bf01887501},
  url = {https://pubmed.ncbi.nlm.nih.gov/761749/},
  note = {Source identifier: 761749}
}