@misc{indiciae46ab69fc5203,
  title = {Gallstone ileus.},
  author = {P A Clavien and J Richon and S Burgan and A Rohner},
  year = {1990},
  doi = {10.1002/bjs.1800770707},
  url = {https://pubmed.ncbi.nlm.nih.gov/2200556/},
  note = {Source identifier: 2200556}
}