“Cobalt and Copper Recovery from the Ancient Flotation Tailings using Selective Sulfation Roast - Leaching Process”, J Min & Metal B Metallurgy, vol. 55, no. 3, pp. 315–324, Jul. 2019, Accessed: Jun. 11, 2026. [Online]. Available: https://test.aseestant.ceon.rs/index.php/jmm/article/view/20815