Castaño González, J. G., C. López de Azcona, and M. Morcillo Linares. “Deterioration of Ancient Metallic Elements Taken from Toledo Cathedral”. Revista De Metalurgia, vol. 37, no. 4, Aug. 2001, pp. 519-27, doi:10.3989/revmetalm.2001.v37.i4.517.