1. International Organization for Standardization (1992) ISO Guide 30 – Terms and definitions used in connection with reference materials. 2nd edn., ISO, Geneva
2. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML (1993) International vocabulary of basic and general terms in metrology. 2nd edn., ISO, Geneva
3. International Organization for Standardization (1995) Guide to the expression of uncertainty in measurement. 2nd edn., ISO, Geneva