1. Reed K, Harvd D, Conroy W (1990) Initial graphics exchange specification (IGES) version 5.0. CAD-CAM Data Exchange Technical Center, Fairfax, VA
2. Owen J (1993) STEP: an introduction. Information Geometers, Winchester, UK
3. Hewlett-Packard Company Staff (1990) The HP-GL/2 reference guide: a handbook for program developers, Addison-Wesley, Reading, MA
4. Swaelens B, Kruth JP (1993) Medical application of rapid prototyping techniques. The 4th international conference on rapid prototyping, Dayton, Ohio, 14–17 June, pp 107–120
5. Rock SJ, Wozny MJ (1991) A flexible file format for solid freeform fabrication. In: Marcus HL et al (eds) Proceedings of solid freeform fabrication symposium, The University of Texas at Austin, 12–14 August, pp 1–12