Islam, I., T. Yasmin, L. Rubaiat, S. S. Arephin, M. M. Hossain, and A. Asfia. “Color Doppler Imaging of Cerebral-Umbilical Pulsatility Ratio in Intrauterine Growth Retardation”. Journal of Enam Medical College, vol. 7, no. 3, Oct. 2017, pp. 140-5, doi:10.3329/jemc.v7i3.34073.