Limpo, J. L. “Oxidizing Leaching of Complex Sulphides in Ammonium Chloride: Sphalerite Leaching Kinetics”. Revista de Metalurgia 33, no. 4 (August 30, 1997): 258–270. Accessed April 28, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/853.