EL-Sherbeny, M. Salah, A. M. Rashad, and D. M. Gharieb. “THE OPTIMAL SYSTEM FOR SERIES SYSTEMS WITH WARM STANDBY COMPONENTS AND A REPAIRABLE SERVICE STATION”. Pakistan Journal of Statistics and Operation Research 5, no. 1 (January 1, 2009): 1-17. Accessed August 3, 2025. https://pjsor.com/pjsor/article/view/150.