1. Dassault Systèmes, Catia product information. http://www.catia.com/; 2003.
2. Parametric Technology Corporation, Pro/ENGINEER product information. http://www.ptc.com/; 2003.
3. Electronic Data Systems, Solid Edge product information. http://www.solidedge.com/; 2003.
4. Parametric Technology Corporation, Pro/CONCEPT product information. http://www.ptc.com/; 2003.
5. Feature modelling and conversion—key concepts to concurrent engineering;Bronsvoort;Comput Ind,1993