1. Jiang Xiangqian, Review of the next generation GPS, in: Second International Symposium on Instrumentation Science and Technology, Jinan, China, 2002.
2. BIPM, ISO, et al., International Vocabulary of Basic and General Terms in Metrology, second ed., ISO, Geneva, Switzerland, 1993.
3. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, Guide to the Expression of Uncertainty in Measurement, first ed., ISO, Geneva, Switzerland, 1993.
4. Vijay Srinivasan, An integrated view of geometrical product specification and verification, in: Proceedings of Seventh CIRP Seminars on Computer Aided Tolerancing, France, 2001, pp. 7–18.
5. ISO/TC 213, ISO/TS 17450-2, Geometrical Product Specifications (GPS) – General concepts – Part 2: Basic tenets, Specifications, Operators and Uncertainties, ISO, 2002.