1. P. Bennich, “Chains of Standards–A New Concept in GPS Standards”, Manufacturing Review, The American Society of Mechanical Engineers, Vol. 7, No. 1, pp. 29–38, 1994.
2. Guide to the Expression of Uncertainty in Measurement, ISO, 1995.
3. http://www.ds.dk
/isotc213
4. ISO/TS 17450–1, Geometrical Product Specifications (GPS) - General concepts - Part 1: Model for geometrical specification and verification.
5. ISO/DTS 17450–2, Geometrical Product Specifications (GPS) - General concepts - Part 2: Operators and uncertainties.