TY  - RPRT
TI  - Pharmacologically active I.U.D.s.
AU  - D Wolfers
PY  - 1972
DO  - 10.1136/bmj.1.5792.112-a
UR  - https://pubmed.ncbi.nlm.nih.gov/5007062/
ID  - 5007062
ER  -