«Reliability Evaluation and Optimization of Solar Based Ammonia Urea Production System: A Study on Lethal and Nonlethal Failures with Coverage Factor Considerations» (2025) Nigerian Journal of Operations Research, 3(1), pp. 20–41. Disponibile su: https://nijor.org.ng/index.php/nijor/article/view/4 (Consultato: 15 giugno 2026).