Orac, Dusan, Tomas Havlik, Anja Maul, and Mattias Berwanger. 2015. “Acidic Leaching of Copper and Tin from Used Consumer Equipment”. Journal of Mining and Metallurgy, Section B: Metallurgy 51 (2), 153-61. https://aseestant.ceon.rs/index.php/jmm/article/view/7249.