1. ANSI/AGMA 2101-D04 Standard: Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth, Virginia, USA (2004)
2. ISO Standard 6336: Calculation of Load Capacity of Spur and Helical Gears – Basic Principles, Introduction and General Influence Factors, Part 1, Switzerland (2006)
3. ISO Standard 6336: Calculation of Load Capacity of Spur and Helical Gears – Calculation of Tooth Bending Strength, Part 3, London, UK (2006)
4. ISO Standard 6336: Calculation of Load Capacity of Spur and Helical Gears – Strength and Quality of Materials, Part 5, Switzerland (2003)