TY  - RPRT
TI  - Developments in steroidal hormonal contraception.
AU  - A Klopper
PY  - 1970
DO  - 10.1093/oxfordjournals.bmb.a070741
UR  - https://pubmed.ncbi.nlm.nih.gov/4312781/
ID  - 4312781
ER  -