Kayembe, K. O., B. C. Mobangolo, K. M. Mbayo, K. S. Muhune, M. E. Kalonda, K. D. Tshibanda, and S. J.-B. Lumbu. “Leaching of Germanium from the Slag of the GECAMINES Factories in Lubumbashi by Oxalic and Sulfuric Acids”. European Journal of Science, Innovation and Technology, Vol. 3, no. 4, Aug. 2023, pp. 95-104, https://ejsit-journal.com/index.php/ejsit/article/view/244.