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\bibitem{Kim_etal2017} {\textquotedblleft}\textit{Selective leaching of Pb, Cu, Ni and Zn from secondary lead smelting residues}{\textquotedblright}. Kim E, Horckmans L, Spooren J, Vrancken KC, Quaghebeur M, Broos K, Hydrometallurgy \textbf{169}, 372 (2017).   http://doi.org/10.1016/J.HYDROMET.2017.02.027

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