1. Guide to expression of uncertainty in measurement (GUM), BIPM/IEC/IFCC/ISO/UPAC/UPAP/OIML, 1993 (corrected and reprinted 1995).
2. EA-4/02: Expression of the Uncertainty of Measurement in Calibration, December 1999.
3. ISO 10576-1:2003 Statistical methods – Guidelines for the evaluation of conformity with specified requirements – Part 1: General principles.
4. ISO 3951-2:2006 Sampling procedures for inspection by variables – Part 2: General specification for single sampling plans indexed by acceptable quality limit (AQL) for lot-by-lot inspection of independent quality characteristics.