Rahman, Md Arif, and Md Rashedul Hoque. “Fitting Time to First Birth Using Extended Cox Regression Model in Presence of Nonproportional Hazard”. Dhaka University Journal of Science 63, no. 1 (January 28, 2015): 25–30. Accessed November 21, 2024. https://banglajol.info/index.php/DUJS/article/view/21764.