1. E. Prichard, in: E.J. Newman (Editor), Quality in the Analytical Chemistry Laboratory, Wiley, Chichester, 1995.
2. Setting the Standard – 25 years of Quality Measurements, European Commission, Brussels, 1998.
3. H. Günzler (Editor), Accreditation and Quality Assurance in Analytical Chemistry, Springer Verlag, Berlin, 1996.
4. Ph. Quevauviller, E.A. Maier, in: K. Kramer (Editor), Production of Certified Reference Materials for Pollutants in Environmental Matrices, EUR Report, 18157 EN, European Commission, Brussels, 1998.
5. E.A. Maier, Ph. Quevauviller, in: W.P. Cofino, B. Griepink (Editors), Quality Management in Chemical Laboratories, Elsevier, Amsterdam, in press.