Najafi, Mahnam, and Hiva Faroughi. “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, vol. 2, no. 4, Dec. 2025, pp. 234-51, https://doi.org/10.48313/scodm.v2i4.47.