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Obstetrics and Gynecology|June 1, 1976
Origin of amniotic fluid alpha-fetoprotein in normal and defective pregnanciesR R Weiss, J N Macri, K W Elligers
Obstetrics and Gynecology|December 1, 1976
Maternal serum and amniotic fluid alpha-fetoprotein as a marker of acute fetal distress in a midtrimester abortion modelR R Weiss, J N Macri, J Robins, et al.
JAMA|September 13, 1976
Prenatal diagnosis of neural tube defectsJ N Macri, R R Weiss, R Tillitt, et al.
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