1. ISO 6336-5:2003(E): Calculation of load capacity of spurs and helical gears – Part 5: Strength and Quality of Materials, 2003-07-01, International Organization for Standardization, Geneva, Switzerland.
2. DIN 3990-5:1987-12: Calculation of Load Capacity Of Cylindrical Gears; Endurance Limits nd Material Qualities, 1987-12, German Institute for Standardization, Berlin, Germany.
3. Einfluss der Wärmebehandlungsparameter auf die Maßhaltigkeit von Stählen (Influence of Heat Treatment Parameters on the Dimensional Stability of Steels), BHM Berg- und Hüttenmännische Monatshefte;Surberg,2010
4. P. Stratton, The effect of cold treatments on the lubricated wear of case hardened components, in: Proceedings of the European Conference on Heat Treatment for Industrial Competitiveness, Verona, Italy, 07.05.2012–09.05.2012.
5. Development of High-Strength Carburized Steels for Automobile Gears;Kanisawa,1995