Abass, Samir A., and Marwa Sh. Elsayed*. “On the Application of Uncertainty Models in Copying Machine Maintenance Problem”. CURRENT APPLIED SCIENCE AND TECHNOLOGY 12, no. 1 (March 30, 2018): 62–76. accessed August 27, 2026. https://li01.tci-thaijo.org/index.php/cast/article/view/136383.