@misc{indiciae0715c9f837b4,
  title = {Gallstone ileus.},
  author = {H P Grewal and N J Everitt and D P Fossard},
  year = {1991},
  doi = {10.1002/bjs.1800780242},
  url = {https://pubmed.ncbi.nlm.nih.gov/2015490/},
  note = {Source identifier: 2015490}
}