@misc{indiciaecad915669ef5,
  title = {Choledochoscopy in choledocholithiasis.},
  author = {C J Longland},
  year = {1973},
  doi = {10.1002/bjs.1800600812},
  url = {https://pubmed.ncbi.nlm.nih.gov/4724203/},
  note = {Source identifier: 4724203}
}