TY  - RPRT
TI  - Endoscopy for acute upper gastrointestinal bleeding.
AU  - D S Zimmon
AU  - D B Falkenstein
AU  - J Nudel
PY  - 1977
DO  - 10.1016/s0140-6736(77)91468-4
UR  - https://pubmed.ncbi.nlm.nih.gov/71434/
ID  - 71434
ER  -