Reliability Evaluation and Optimization of Solar Based Ammonia Urea Production System: A Study on Lethal and Nonlethal Failures with Coverage Factor Considerations. Nigerian Journal of Operations Research, [S. l.], v. 3, n. 1, p. 20–41, 2025. Disponível em: https://nijor.org.ng/index.php/nijor/article/view/4. Acesso em: 15 giu. 2026.