1. Quality assurance in research and development: an insoluble dilemma?;Krapp;Fresenius J. Anal. Chem.,2001
2. Eurachem guide, The fitness for purpose of analytical methods, Edition 1.0, 1998
3. DIN32645 Nachweis-, Erfassungs- und Bestimmungsgrenze, Beuth Verlag GmbH Mai 1994
4. DIN51418-2 Röntgenemissions- und Röntgenfluoreszenz-Analyse (RFA), Beuth Verlag GmbH September 1996
5. EURACHEM/CITAC Guide, Quantifying uncertainty in analytical measurement, second edition, Final Draft, April 2000. EURACHEM: Available from: http://www.measurementuncertainty.org