1. Ford Quality System Standard Q-101, Ford Motor Company 1990
2. Dietrich E, Schlosser D, Schule A (1991) QZ 36:153?158
3. Thierig D (1992) In: Nauche R (ed) Commission of European Communities, Progress of analytical chemistry in the iron and steel industry. Luxembourg, pp 348?354
4. Block contribution of various authors (1992) Quality Assurance in Analytical chemistry. Fresenius J Anal Chem 342:760?790
5. Commission of the European Communities (1989) CENCER/CSCN 394 (89) 209 final-SYN 208