Biswas, Pratima Rani, Gautom Kumar Paul, Mahmuda Khatun, Mamata Manjuri, and Samima Rahman. “‘Early Screening Test for High Risk Pregnancies by Second Trimester Color Doppler Imaging Of the Feto-Placental Circulation’”. International Journal of Medical Science and Clinical Invention 8, no. 09 (September 11, 2021): 5615–5620. Accessed August 11, 2024. https://valleyinternational.net/index.php/ijmsci/article/view/3223.