Carbajo-de-Lera, P., R. Alfalla-Luque, and C. Medina-Lopez. “The Supply Chain in the Metallurgical Sector: An Analysis of the Main Links”. WPOM-Working Papers on Operations Management, vol. 2, no. 2, Dec. 2011, pp. 14-24, doi:10.4995/wpom.v2i2.867.