1. 1. Barnhard Y, Bar-Hava I, Divon MY. Accuracy of intra partum estimates of fetal weight: Effect of oligohydramnios. J Reprod Med 1996;41:907-910.
2. Limitations of clinical and sonographic estimates of birth weight: experience with 1034 parturients;Chauhan;ObstetGynecol,1998
3. 3. Nahum, Gerard G, Stanislaw, Harold. Ultrasonographic prediction of term birth weight: How accurate is it? American J Obstetrics &Gyaneacol 2003; 188(2): 556-74.
4. 4. Joseph Woo. A short History of the development of Ultrasound in Obstetrics and Gynecology. 1998-2001 access date Nov 04, 2004 available from www.yahoo.com.
5. 5. Nzeh DA, Oyawoye O, Adetoro OO. Ultrasound estimation of birth weight in late pregnancy among African women. West African J Ultrasound 2000;1:9-14.