Taher, M. A. (2012) “Doppler Flow Velocity Indices (RI, PI, S/D & PSV) of Fetal Middle Cerebral Artery in Normal Pregnancies: Correlation with Gestational Age of 20 to 40 Weeks”, BIRDEM Medical Journal, 2(2), pp. 77–80. doi: 10.3329/birdem.v2i2.12306.