1. Digital Representation for Communication of Product Definition Data,1981
2. IGES—Schnittstelle fir die Oberflporfschenbeschreibung in der Automobilindustrie,1983
3. NBSIR B2-2631 (AF), Initial Graphics Exchange Specification (IGES) Version 2.0, National Bureau of Standards.
4. VDAFS, VDA—Flporfschen-Schnittstelle, VDA, Frankfurt, Germany.