Sánchez, L., A. Roca, M. Cruells, and J. Viñals. “Study by Sulphidizing-Cyanidation of Jarosite-Beudantite Solid Solutions Reactivity”. Revista De Metalurgia, vol. 34, no. Extra, May 1998, pp. 400-4, doi:10.3989/revmetalm.1998.v34.iExtra.780.