@misc{indiciae9a051abddf3a,
  title = {Endoscopy in gastrointestinal bleeding.},
  author = {J A Forrest and N D Finlayson and D J Shearman},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91770-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4136718/},
  note = {Source identifier: 4136718}
}