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3. Harmonised Guidelines for the Use of Recovery Information in Analytical Measurement, IUPAC/ISO/AOAC International/EURACHEM, 1995, http://www.eurachem.ul.pt/guides/recovery.pdf.
4. Guide to the Expression of Uncertainty in Measurement, ISO, Geneva, 1993.
5. A2LA Guide for the Estimation of Measurement Uncertainty in Testing, American Association for Laboratory Accreditation, 2002, http://www.a2la.org/guidance/est_mu_testing.pdf.