Bala, Saminu I., Ibrahim Yusuf, and Yasin Ali Nuhu. “Markov Chain Approach to Availability and Profit Evaluation of a Series-Parallel System With Minor and Major Failures”. International Journal of Applied Mathematical Research 6, no. 3 (June 4, 2017): 67–73. Accessed May 4, 2024. https://www.sciencepubco.com/index.php/ijamr/article/view/7813.