1. ISO 6983-1 Numeric control of machines—Program format and definition of address words—Part 1: Data format for positioning, line motion and contouring control systems, 1982.
2. Hardwick, M. Digital manufacturing using STEP-NC, AUTO-TECH 2001 Conference & Exhibition, AIAG, August 28–30, 2001, Detroit's Cobo Centre, USA.
3. ISO 14649-1:2003 Industrial automation systems and integration—Physical device control—Data model for computerized numerical controllers—Part 1: Overview and fundamental principles, ISO TC 184/SC 1, March 3, 2003.
4. STEP-NC Newsletter. Issue 3, November 2000, http://www.stepnc.org/.
5. Müller, P. NC—Controllers, STEP-NC + Status of Standardisation ISO 14649, EMO Hannover, September 2001.