Smithson, Haixia, and Jyotirmoy Sarkar. “System Maintenance Using Several Imperfect Repairs Before a Perfect Repair ”. Statistics, Optimization & Information Computing 9, no. 1 (January 22, 2021): 176-188. Accessed November 15, 2024. http://47.88.85.238/index.php/soic/article/view/861.