Abreu, C. M., J. Cristóbal, X. R. Nóvoa, G. Pena, and M. C. Pérez. “Analysis of the Passive Layer Developed on Stainless Steels Implanted With Chromium”. Revista De Metalurgia, vol. 40, no. 3, June 2004, pp. 224-9, doi:10.3989/revmetalm.2004.v40.i3.269.