Martín, M. I., F. A. López, and F. J. Alguacil. “Kinetic Study of the Removal of Cu (II) from Aqueous Solutions by Rolling Mill Scale”. Revista De Metalurgia, vol. 41, no. 4, Aug. 2005, pp. 292-7, doi:10.3989/revmetalm.2005.v41.i4.217.