Khanal, Shankar, V. Sreenivas, and S.K. Acharya. “Cox Proportional Hazards Model for Identification of the Prognostic Factors in the Survival of Acute Liver Failure Patients in India”. Nepalese Journal of Statistics 2 (September 26, 2018): 53-74. Accessed November 30, 2020. https://www.nepjol.info/index.php/NJS/article/view/21155.