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2. Considerations on future redefinitions of the kilogram, the mole, and the other units;Becker;Metrologia,2007
3. BIPM IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, OIML. JCGM 100:2008. Evaluation of Measurement data. Guide to the expression on uncertainty in measurement, France: BIPM, 2008.
4. BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, OIML. JCGM 101:2008. Supplement 1, to the Guide to the expression on uncertainty in measurement. Propagation of distributions using Monte Carlo method. Sevres, France, 2008.
5. BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, OIML. JCGM 200:2008. International Vocabulary of Metrology. Basic in general concepts and associated terms, Sevres, France: BIPM, 2008.