Susanti, Oknovia, and Zeky Azizi. “Rare Earth Elements (REE) Extraction from The Stones Hill at Padang Area by Precipitation ”. Jurnal Penelitian Pendidikan IPA 10, no. 7 (July 25, 2023): 3968–3974. Accessed August 4, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/8277.