TY  - RPRT
TI  - Monochorionic twinning: sonographic assessment.
AU  - R A Filly
AU  - R B Goldstein
AU  - P W Callen
PY  - 1990
DO  - 10.2214/ajr.154.3.2106205
UR  - https://pubmed.ncbi.nlm.nih.gov/2106205/
ID  - 2106205
ER  -