@misc{indiciaeb05335c75372,
  title = {Endoscopic retrograde cholangiography.},
  author = {M O Blackstone and A L Blum},
  year = {1977},
  doi = {10.1007/bf01071899},
  url = {https://pubmed.ncbi.nlm.nih.gov/855857/},
  note = {Source identifier: 855857}
}