Kim, James J., Mohan L. Chaudhry, and Abdalla Mansur. “Asymptotic Results for the First and Second Moments and Numerical Computations in Discrete-Time Bulk-Renewal Process”. Yugoslav Journal of Operations Research 29, no. 1 (February 1, 2019): 135–144. Accessed August 26, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/564.