Ndlovu, Bonginkosi D., Sileshi F. Melesse, and Temesgen Zewotir. “A Nonparametric Vertical Model: An Application to Discrete Time Competing Risks Data With Missing Failure Causes”. South African Statistical Journal 54, no. 2 (September 30, 2020): 231–241. Accessed April 3, 2026. https://www.journals.ac.za/index.php/sasj/article/view/4992.