TY  - RPRT
TI  - Twin zygosity and pre-eclampsia.
AU  - D M Campbell
AU  - I MacGillivray
AU  - B Thompson
PY  - 1977
DO  - 10.1016/s0140-6736(77)90109-x
UR  - https://pubmed.ncbi.nlm.nih.gov/69187/
ID  - 69187
ER  -