1. ISO 1101: 2004, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances of form, orientation, location and run-out.
2. ISO/TS 14253-2: 1999, Geometrical product specification (GPS) – Inspection by Measurement of Workpieces and Measuring Equipment – Part 2: Guide to the Estimation of Uncertainty in GPS Measurement, in Calibration of Measuring Equipment and in Product Verification.
3. ISO/TS 12781-1: 2003, Geometrical product specifications (GPS) – Flatness – Part 1: Vocabulary and parameters of flatness.
4. ISO/TS 12781-2: 2003, Geometrical product specifications (GPS) – Flatness – Part 2: Specification operators.
5. Evaluation and management procedure of measurement uncertainty in new generation geometrical product specification (GPS);Peng;Measurement,2009