@misc{indiciae0fe71e0302a1,
  title = {Endoscopy for acute upper gastrointestinal bleeding.},
  author = {D S Zimmon and D B Falkenstein and J Nudel},
  year = {1977},
  doi = {10.1016/s0140-6736(77)91468-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/71434/},
  note = {Source identifier: 71434}
}