DIN EN ISO 17450-2-2013 产品几何技术规范(GPS).通用概念.第2部分:基本原理、规范、运算符、不确定性和歧义(ISO 17450-2-2012).德文版本EN ISO 17450-2-2012
Geometrical product specifications (GPS) - General concepts - Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (ISO 17450-2:2012); German version EN ISO 17450-2:2012