@misc{indiciae31710599992b,
  title = {Gallstone ileus after endoscopic sphincterotomy.},
  author = {F Halter and U Bangerter and J P Gigon and C Pusterla},
  year = {1981},
  doi = {10.1055/s-2007-1021655},
  url = {https://pubmed.ncbi.nlm.nih.gov/7227334/},
  note = {Source identifier: 7227334}
}