1. ISO 14253-2:2011 Geometrical product specifications (GPS). Inspection by measurement of workpieces and measuring equipment. Part 2: Guidance for the estimation of uncertainty in GPS measurement, in calibration of measuring equipment and in product verification.
2. Weckenmann A, Werner T. Reducing operator influences on results in coordinate metrology via a holistic qualification concept. 9th ISMQC, Madras 2007.
3. ISO 8015:2011 Geometrical product specifications (GPS). Fundamentals. Concepts, principles and rules.
4. ISO 14405-1:2010 Geometrical product specifications (GPS). Dimensional tolerancing. Part 1: Linear sizes.
5. ISO 286-1:2010 Geometrical product specifications (GPS). ISO code system for tolerances on linear sizes. Part 1: Basis of tolerances, deviations and fits.