3Jiang Xiangqian. Establishing a Worldwide GPS Business Environment:A Knowledge-based Intelligent GPS System. http://www. eoi. eordis. lu/.
4Jiang Xiangqian. Review of the Next Generation GPS.2nd International Symposium on Instrumentation Science and Technology ,Jinan,China,2002.
5Bennich P. Chains of Standards-a New Concept in GPS Standards. Manufacturing Review, The American Society of Mechanical Engineers, 1994,7 ( 1 ): 29- 38.
6Ma Limin, Jiang Xiangqian, Wang Jinxing,et al. Expression Specifications of Geometrical Product Based on the Improved GPS Language. 3nd International Symposium on Instrumentation Science and Technology, Xi'an. China, 2004.
8ISO 14660-2:1999 Geometrical product specification(GPS)-Geometrical features-Extracted median line of a cylinder and a cone, extracted median surface, local size of extracted feature.
9ISO/TS 17450-1:2000(E) Geometrical product specifications (GPS)-General concepts-Part 2:Model for geometrical specification and verification.
