TY  - RPRT
TI  - Estimating gestational age from biparietal diameter: a simple formula.
AU  - F C Laing
AU  - W M Stevenson
PY  - 1986
DO  - 10.7863/jum.1986.5.1.44
UR  - https://pubmed.ncbi.nlm.nih.gov/3944845/
ID  - 3944845
ER  -