TY  - RPRT
TI  - A double-balloon ureteric-stone extractor.
AU  - J P Williams
PY  - 1969
DO  - 10.1016/s0140-6736(69)90432-2
UR  - https://pubmed.ncbi.nlm.nih.gov/4186171/
ID  - 4186171
ER  -