di Yorio, C., Betancourt, E., Vivas, R. and Rus, J. 2006. Ni, Co recovery study and Fe by acid leaching in columns. Revista de Metalurgia. 42, 1 (Feb. 2006), 41–48. DOI:https://doi.org/10.3989/revmetalm.2006.v42.i1.5.