Bhatia, Shweta, and Maitri Shah. “A Retrospective Study of Umbilical Artery S/D Ratio Assessment on Color Doppler for Monitoring of Fetal Well-Being in Patients With Intrauterine Growth Retardation and Its Correlation With Perinatal Outcomes”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 13, no. 1 (December 29, 2023): 139–144. Accessed October 28, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/13709.