1. ISO/TR 14638:1995, Geometrical product specification (GPS)—Masterplan.
2. ISO/TC213, 2002, ISO/TC213; ISO/TS 17450-2: Geometrical Product Specifications (GPS)–General Concepts–Part 2: Basic tenets, specifications, operators and Uncertainties. Geneva; 2002.
3. Srinivasan V. An integrated view of geometrical product specification and verification. In: Proceedings 7th CIRP CAT seminar. 2001.
4. Lu W, Jiang X, Scott PJ, Lan X. A host system for form tolerance specification in the next-generation GPS based on AutoCAD. In: Proceeding 11th CIRP CAT seminar. 2009.
5. CAA V5 Encyclopedia 2007, Dassault Systèmes. http://www.3ds.com.