1. Task-Specific Gauge for the Inspection of Coordinate Measuring Machines;Pfeifer;Annals of the CIRP,1994
2. Härtig, F., Kniel, K., Goch, G (2011) Kegelradnormal, Patent DE 10 2009 020 977 B4.
3. Calibration System of Involute Tooth Form Checker Using Ball Artifacts;Kubo;VDI-Berichte,2005
4. Cox, B.L (2001) Update on the National Center for Gear, Metrology, SME.
5. Two Highly Accurate Methods for Pitch Calibration;Kniel;Measurement Science and Technology,2009