1. The reliability of values of molar mass, the factor that relates measurements expressed in two SI base units (mass and amount of substance)
2. Ellison, S. L.R., Rosslein, M. and Williams, A. 2000.Eurachem‐Citac Guide Quantifying Uncertainty in Analytical Measurement, 2nd ed. 4–31. Eurachem, UK: Department of Trade and Industry, National Measurement System Valid Analytical Measurement Programme.
3. ISO (International Organization for Standardization). 1993.International Vocabulary of Basic and General Terms in Metrology, 2nd ed. 25Geneva, Switzerland: ISO.