M. P. Anilkumar, and K. P. Jose. “A Discrete Time Geo/Geo/1 Inventory System With Modified \(N\)-Policy”. Malaya Journal of Matematik 8, no. 03 (July 1, 2020): 868–876. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1521.