1. 1) E. Weck and E. Leistner: Metallographic Instructions for Colour Etching by Immersion, Part 3, Non-ferrous Metals, Cemented Carbides and Ferrous Metals, Nickel-base and Cobalt-base Alloys, (Deutscher Verlag für Schweibtechnik, Düsseldorf, 1986).
2. 2) L. Gao, Y. Harada and S. Kumai: Mater. Charact. 107 (2015) 426–433.
3. 3) L. Gao, Y. Harada and S. Kumai: Mater. Charact. 107 (2015) 434–452.
4. 4) B. Suárez-Peña, J. Asensio-Lozano and G.F. Vander-Voort: Rev. Metal. 46 (2010) 469–476.
5. 5) R.L.K. Hugh, P. Godard, W.B. Jepson and M.R. Bothwell: Corrosion of Light Metals, (John Wiley and Sons, New York, 1967).