Chander, S., and M. . Singh. “RELIABILITY MODELING OF 2-OUT-Of-3 REDUNDANT SYSTEM SUBJECT TO DEGRADATION AFTER REPAIR”. Journal of Reliability and Statistical Studies, vol. 2, no. 2, Dec. 2009, pp. 91-104, https://journals.riverpublishers.com/index.php/JRSS/article/view/22075.