1. Joint Committee for Guides in Metrology (JCGM) (2012) International vocabulary of metrology: basic and general concepts and associated terms (VIM), JCGM 200:2012, 3th edn. 2008 version with minor corrections. BIPM, Sèvres, France. Internet: http://www.bipm.org/vim
2. Eurachem/Citac Guide CG 4 (2000) Quantifying uncertainty in analytical measurement, 2nd edn. Eurachem/Citac Working Group, London
3. ISO/IEC 17025 (2005) General requirements for the competence of testing and calibration laboratories. ISO, Geneva
4. Bich W (2009) Accred Qual Assur 14:581–586
5. Silva RJNB, Camões MFGFC (2010) Accred Qual Assur 15:691–704