Sancho, J. P., Fernández, B., Ayala, J., García, M. P. and Lavandeira, A. (2009) “Uses of the potassium permanganate to eliminate copper cyanide from waste water resulting from a lixiviation plant in a gold mine (I)”, Revista de Metalurgia, 45(6), pp. 415–423. doi: 10.3989/revmetalm.0846.