TY  - RPRT
TI  - Contraceptive efficacy determination by postcoital testing.
AU  - H Brehm
AU  - I Albrecht
PY  - 1978
DO  - 10.1016/s0015-0282(16)43090-6
UR  - https://pubmed.ncbi.nlm.nih.gov/580086/
ID  - 580086
ER  -