Fosca, C., C. Merino, E. Otero, and P. Hierro. “Color Metallography of Stainless Steels by Tint Etching”. Revista De Metalurgia, vol. 32, no. 4, Aug. 1996, pp. 223-30, doi:10.3989/revmetalm.1996.v32.i4.904.