1. Guide to the Expression of Uncertainty in Measurement;ISO GUM,1993
2. Quantifying Uncertainty in Analytical Measurement;EURACHEM/CITAC,2000
3. Uncertainty budget for final assay of a pharmaceutical product based on RP–HPLC
4. Sampling of Heterogeneous and Dynamic Material Systems;Gy,1992
5. Statistical Aspects of Sampling from Bulk Materials: Part 1. General Principles;ISO/FDIS 11648-1,2002