@misc{indiciaea2076edac3fc,
  title = {Letter: Occult perforations.},
  author = {B K Mandal and P F Schofield},
  year = {1976},
  doi = {10.1136/bmj.1.6015.963},
  url = {https://pubmed.ncbi.nlm.nih.gov/1268514/},
  note = {Source identifier: 1268514}
}