TY  - RPRT
TI  - Latest developments in contraception.
AU  - E L Billings
PY  - 1984
DO  - 10.5694/j.1326-5377.1984.tb104116.x
UR  - https://pubmed.ncbi.nlm.nih.gov/6700496/
ID  - 6700496
ER  -