1. AGMA Standard 2001-D04 (2004) Fundamental rating factors and calculation methods for involute spur and helical gear teeth. American Gear Manufacturers Association, Alexandria
2. AGMA Information Sheet 908-B89 (1989) Geometry factors for determining the pitting resistance and bending strength of spur, helical and herringbone gear teeth. American Gear Manufacturers Association, Alexandria
3. ISO Standard 6336-2:2006 (2006) Calculation of load capacity of spur and helical gears—Part 2: Calculation of surface durability (pitting). International Organization for Standardization, Geneva, Switzerland
4. ISO Standard 6336-1:2006 (2006) Calculation of load capacity of spur and helical gears—Part 1: Basic principles, introduction and general influence factors. International Organization for Standardization, Geneva, Switzerland
5. Hayashi K (1963) Load distribution on the contact line of helical gear teeth. JSME Bull 22