TY  - RPRT
TI  - Vasectomy: how much is enough?
AU  - R I Hallan
AU  - A R May
PY  - 1988
DO  - 10.1111/j.1464-410x.1988.tb04369.x
UR  - https://pubmed.ncbi.nlm.nih.gov/3191364/
ID  - 3191364
ER  -