AKKAL, R.; KHODJA, M. PURIFICATION OF FELDSPAR FROM IRON OXIDE IMPURITIES USING NITRIC ACID IN PRESENCE OF AMMONIUM BIUORIDE. Journal of Fundamental and Applied Sciences, [S. l.], v. 12, n. 1S, p. 118–140, 2019. DOI: 10.4314/jfas.v12i1S.10. Disponível em: https://www.jfas.info/index.php/JFAS/article/view/651. Acesso em: 3 nov. 2025.