TY  - RPRT
TI  - "Double-bubble" sign visualized in first-trimester sonogram?".
AU  - B Benacerraf
PY  - 1995
DO  - 10.1016/0002-9378(95)90520-0
UR  - https://pubmed.ncbi.nlm.nih.gov/7755087/
ID  - 7755087
ER  -