suleiman, kabiru, Ibrahim Yusuf, Saminu I. Bala, and Uba Ahmad Ali. “Mean Time to System Failure and Availability Modeling of a Repairable Non Identical Three Unit Warm Standby Redundant System”. International Journal of Basic and Applied Sciences 1, no. 4 (September 12, 2012): 523–533. Accessed May 4, 2024. https://sciencepubco.com/index.php/ijbas/article/view/413.