Rahman MA, Hoque MR. Fitting Time to First Birth Using Extended Cox Regression Model in Presence of Nonproportional Hazard. Dhaka Univ. J. Sci. [Internet]. 2015 Jan. 28 [cited 2024 Nov. 21];63(1):25-30. Available from: https://banglajol.info/index.php/DUJS/article/view/21764