TY  - RPRT
TI  - [Decrease in twin births in the german federal republic (author's transl)].
AU  - J Krüger
AU  - P Propping
PY  - 1976
DO  - 10.1055/s-0028-1104142
UR  - https://pubmed.ncbi.nlm.nih.gov/943284/
ID  - 943284
ER  -