1. De Bièvre P (2007) Numerosity versus mass. Accred Qual Assur 12:221–222
2. Le Système international d’unités—The International System of Units SI, edition 8, ISBN 92-822-2213-6, BIPM, 2006, www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf
3. BIPM, IEC, IFCC, ILAC, IUPAC, IUPAP, ISO, OIML (2008) The international vocabulary of metrology—basic and general concepts and associated terms (VIM), 3rd edn. JCGM 200:2008, BIPM 2008, Paris-Sèvres, ISBN 92-822-2213-6 http://www.bipm.org/vim
4. Private communication from some CIPM members in 1992 to this editor
5. Report of the 16th session of CCQM, BIPM (2010) http://www.bipm.org/utils/common/pdf/CCQM16.pdf