8Selam B,Koksal R, Ozcan T. Fetal arterial and venous Doppler parameters in the interpretation of oligohydramnios in postterm pregnancies [J]. Ultrasound Obslet Gynecol, 2000,15 (5) : 403-406.
9Erika H,Banks MD,David A,et al. Perinatal risks associated with borderline amniotic fluid index[J]. Am J Obstet Gynecol, 1999,180(6): 1461- 1463.
