Echeverry-Vargas, L., Rojas-Reyes, N. R., & Estupiñán, E. (2017). Characterization of copper smelter slag and recovery of residual metals from these residues. Revista Facultad de Ingeniería, 26(44), 61–71. https://doi.org/10.19053/01211129.v26.n44.2017.5772