2Cunninghan F G, Gant N F, Leveno K J, et al. Williams Obstetrics 21 st Edition Copyright 2001 by McGraw - Hill Companies, Inc. 567 - 609.
3Purwau M, Kulkan H, Motghart N, et al. Calciun supplementation and prevention of pregnancy induced hypertension. J Obstet Gynaecol, 1996, 22 (5): 452.
4Johnson RD, Poladoski K, Everson WV, et al. Aspirin induces incresed expression of both prostaglandin cultured human placental. Am J Obstet Gynaecol, 1997, 177(1): 78 -85.
5Neri I, Mazza V, Galassi Mc, et al. Effects of L - arginine on utero - placental circulation in growth - retarded fetuses. Acta Obstet Gynecol Scand, 1996, 75 (3): 208.
6James D K, Steer P J, Weiner C P, et al. High risk pregnancy management options. Second edition. Hypertension in Pregnancy. Science press harcourt asia. W. B. Saunders,2001. 639 - 656.
7Ling F W, Dutt P, Egermant R S, et al. Obstertics and gynecoloy principles for practice. McGraw - Hill, 2001. 244- 252.
8J Cardo, Dillon K G, et al. Hemodynamic comparison of mild and severe preeclampsia: concept of stroke systemic vascular resistance index. J Matern Fetal Med, 1996, 5(5): 268 - 272.
9Cotton B D, Guest Edttor. Critical care on obstetrics and gynecology clinics of north america. Am J Obstet Gynaecol,1991, 18 (2): 165-195.
