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3. Report on the relationship between analytical results, measurement uncertainty, recovery factors and the provisions of EU Food and Feed legislation. http://ec.europa.eu/food/food/chemicalsafety/contaminants/report sampling_analysis_2004_en.pdf
4. Guide to the expression of uncertainty in measurement (GUM) (1993) ISO Geneva; also JCMG 100. http://www.bipm.org/en/publications/guides/gum
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