Mangal, R., and L. Bhandari. “A Retrospective Sonological Evaluation of Placental Thickness With Respect to the Gestational Age in a Tertiary Care Hospital in Rajsamand”. International Archives of BioMedical and Clinical Research, Vol. 6, no. 2, June 2020, pp. RD1-RD3, https://iabcr.org/index.php/iabcr/article/view/596.