Media type: E-Article Title: Solution to quality assurance challenge 4 Contributor: Reichenbächer, Manfred; Einax, Jürgen W. imprint: Springer Science and Business Media LLC, 2007 Published in: Analytical and Bioanalytical Chemistry Language: English DOI: 10.1007/s00216-006-1060-7 ISSN: 1618-2650; 1618-2642 Keywords: Biochemistry ; Analytical Chemistry Origination: Footnote: