“Two-Stage Leaching of Germanium from Copper Cake under Subsequent Non-Oxidizing and Oxidizing Conditions”. Journal of Mining and Metallurgy, Section B: Metallurgy 61, no. 1 (July 16, 2025): 59–70. Accessed June 11, 2026. https://test.aseestant.ceon.rs/index.php/jmm/article/view/55199.