M. . Najafi and H. . Faroughi, “Opportunistic Maintenance Modeling in a Closed-Loop Supply Chain: The Impact of Spare Parts Material, Technician Skill, and Environmental Conditions”, Sup. Chain. Oper. Decis. Mak., vol. 2, no. 4, pp. 234–251, Dec. 2025, doi: 10.48313/scodm.v2i4.47.