Casarin, S. J., H-J. Kestenbach, and E. Valencia. 1999. “The Influence of Intercritical Tempering Treatment on the Nickel Concentration of Retained Austenite Composition of a 9 % Ni Steel”. Revista De Metalurgia 35 (3):148-54. https://doi.org/10.3989/revmetalm.1999.v35.i3.618.