TY  - RPRT
TI  - Observer error in ultrasonic fetal cephalometry.
AU  - P Bergsjoo
AU  - T Bakke
AU  - L Salamonsen
PY  - 1975
DO  - 10.3109/00016347509158664
UR  - https://pubmed.ncbi.nlm.nih.gov/1167725/
ID  - 1167725
ER  -