1. ISO/TR 14638: 1995 Geometrical Product Specification (GPS) – Masterplan, International Organization for Standardization.
2. Dimensional micro and nano metrology;Hansen;Ann. CIRP,2006
3. Fundamental Good Practice in Dimensional Metrology NPL Good Practice Guide No 80;Flack,2005
4. The Gage Block Handbook;Doiron,1995
5. ISO 3650: 1998 Geometrical Product Specifications (GPS) – Length Standards – Gauge Blocks, International Organization for Standardization.