Khedlekar, U.K., A. Namdeo, and A. Nigwal. “Production Inventory Model With Disruption Considering Shortage and Time Proportional Demand”. Yugoslav Journal of Operations Research 28, no. 1 (February 1, 2018): 123–139. Accessed August 26, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/530.