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2. ANSI/AGMA 2009-B01, 2005, Bevel Gear Classification, Tolerances, and Measuring Methods.
3. Salomons O., Van Houten F., Kals H., 1998, Current Status of CAT Systems, Geometric Design Tolerancing: Theories, Standards and Applications, pp. 438–452, ISBN O-412-83000-0.
4. Gear Metrology;Goch;Annals of CIRP,2003
5. ISO/TS 17450-1, 2005, Geometric Product Specification (GPS) – General concepts – Part 1: Model for geometrical specification and verification.