Dr. Heisnam Brojeshwor Singh. “Determinants of Postpartum Amenorrhoea in Rural Manipur Valley: A Cox Proportional Hazards Analysis ”. Journal of Computational Analysis and Applications (JoCAAA), vol. 30, no. 1, Jan. 2022, pp. 927-35, https://eudoxuspress.com/index.php/pub/article/view/5321.