1. ISO 21771:2007-09: Gears – Cylindrical involute gears and gear pairs – Concepts and geometry.
2. ISO 1328-1:2013-09 Cylindrical gears – ISO system of flank tolerance classification – Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth.
3. VDI/VDE 2612 Blatt 1:2016–04 – Entwurf: Measurement and testing of gears – Evaluation of profile and helix measurements on cylindrical gears with involute profile.
4. VDI/VDE 2613:2003-12: Pitch and runout testing on gearings – Cylindrical gears, whormwheels [sic!], bevel gears.
5. Messtechnische Erfassung Polyevolventer Profile am Beispiel des Wälzfräsers;Härtig,1994