TY  - RPRT
TI  - Second-trimester placental changes associated with elevated maternal serum alpha-fetoprotein.
AU  - E A Perkes
AU  - R S Baim
AU  - K J Goodman
AU  - J N Macri
PY  - 1982
DO  - 10.1016/0002-9378(82)90188-0
UR  - https://pubmed.ncbi.nlm.nih.gov/6183975/
ID  - 6183975
ER  -