Salisu, M. M. and Ali, U.A. (2015) “Availability Determination of a Complex Repairable Series- Parallel System Using Markovian Birth-Death Process”, International Journal of Science for Global Sustainability, 1(1), p. 13. Available at: https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/292 (Accessed: 18 April 2026).