Sion, Alina, und Antoaneta Ene. Sequential Chemical Extraction of Copper from Clay: An Overview. Analele Universității ”Dunărea de Jos” din Galați. Fascicula II, Matematică, fizică, mecanică teoretică / Annals of the ”Dunarea de Jos” University of Galati. Fascicle II, Mathematics, Physics, Theoretical Mechanics 45, no. 2 (Dezember 12, 2022): 53-58. Zugegriffen April 20, 2025. https://gup.ugal.ro/ugaljournals/index.php/math/article/view/5860.