@misc{indiciaeff1b94e17685,
  title = {Operative choledochoscopy.},
  author = {A Kappas and J Alexander-Williams and M R Keighley and G T Watts},
  year = {1979},
  doi = {10.1002/bjs.1800660311},
  url = {https://pubmed.ncbi.nlm.nih.gov/427384/},
  note = {Source identifier: 427384}
}