Najafi, M. and Faroughi, H. 2025. Opportunistic Maintenance Modeling in a Closed-Loop Supply Chain: The Impact of Spare Parts Material, Technician Skill, and Environmental Conditions. Supply Chain and Operations Decision Making. 2, 4 (Dec. 2025), 234–251. DOI:https://doi.org/10.48313/scodm.v2i4.47.