1. UNI EN ISO 4957:2002, Acciai per utensili. UNI, Milano, 2002.
2. Proceedings of the 30th Convegno Nazionale, vol. 50;Firrao,2004
3. A255/99, Standard test method for determining hardenability of steels, ASTM International, 1999.
4. G. Sachs, G.S. Sangdahl, W.F. Brown, Iron Age, November 23, pp. 59–63 and November 30, pp. 76–80, 1950.
5. Cleavage fracture in bainitic and martensitic microstructures