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American Journal of Obstetrics and Gynecology|September 15, 1983
Placental injection studies in twin gestationE G Robertson, K J Neer
American Journal of Obstetrics and Gynecology|September 15, 1978
Asessment of fetal gestational age in high-risk pregnancies by amniotic fluid analyses and ultrasound mensurationE G Robertson, K K Holsinger, K J Neer, et al.
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