TY  - RPRT
TI  - Peroral direct cholangioscopy (PDCS) using routine straight-view endoscope: first report.
AU  - Y Urakami
AU  - E Seifert
AU  - H Butke
PY  - 1977
DO  - 10.1055/s-0028-1098481
UR  - https://pubmed.ncbi.nlm.nih.gov/862583/
ID  - 862583
ER  -