1. ANSI (American National Standards Institute); Digital Representation of Product Defintion Data (Y14.26M), September 1981.
2. Initial Graphics Exchange Specification (IGES); Version 2.0, Februar 1983. U.S. Department of Commerce, National Bureau of Standards.
3. VDAFS Format zum Austausch geometrischer Informationen; Normentwurf filr DIN Norm 66301 DIN NAM 96.4/25-84, Juli 1984.
4. IGES Review and Proposed Extensions; DIN NAM 96.4/2-84, Februar 1984