1. A statistical study of control systems and accidents at work;Backström;Journal of Occupational Accidents,1984
2. Programming of control systems in STEP 5;Berger,1980
3. Unfälle an Maschinen verursacht durch Fehler in der Steurung;BIA-information;Die BG,1983
4. Change Control and Analysis;Bullock;EG & G,1981