Amer, S., and A. Luis. “The Extraction of Zinc and Other Minor Metals from Concentrated Ammonium Chloride Solutions With D2EHPA and Cyanex 272”. Revista de Metalurgia 31, no. 6 (December 30, 1995): 351–360. Accessed April 29, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/933.