References
- Community Bureau of Reference . 1988 . BCR Reference Materials Brussels
- European Standard EN 45 001 . 1988 . General criteria for the operation of testing laboratories , Brussels : CEN/CENELEC .
- European Standard EN 45 002 . 1988 . General criteria for the assessment of testing laboratories , Brussels : CEN/CENELEC .
- European Standard EN 45 003 . 1988 . General criteria for laboratory accreditation bodies , Brussels : CEN/CENELEC .
- International Standard 5725 . 1981 . Precision of test methods—Determination of repeatability and reproducibility by interlabora‐tory tests , Switzerland : ISO .