TY  - RPRT
TI  - The lambda sign in twin pregnancies.
AU  - W Sepulveda
AU  - N J Sebire
AU  - K H Nicolaides
PY  - 1996
DO  - 10.1046/j.1469-0705.1997.08060429-2.x
UR  - https://pubmed.ncbi.nlm.nih.gov/9014287/
ID  - 9014287
ER  -