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2. Hollman PHC, Wagstaffe PJ (1990) Fresenius J Anal Chem 338:430?434
3. ISO 5725-1986 (1993) Precision of test methods. Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests
4. Hollman PHC, Boenke A, Finglas P, Wagstaffe PJ (1993) The certification of the mass fractions of major components and essential elements in a whole milk powder and a lyophilized pork muscle reference material. EUR Rep (in press)