TY  - RPRT
TI  - Twins and twinning.
AU  - J G Hall
PY  - 1996
DO  - 10.1002/(sici)1096-8628(19960122)61:3<202::aid-ajmg2>3.0.co;2-w
UR  - https://pubmed.ncbi.nlm.nih.gov/8741863/
ID  - 8741863
ER  -