1. BIPM, Worldwide metrology: What is metrology? https://www.bipm.org/en/worldwide-metrology/#metrology (assessed 07.20).
2. P. Howarth, F. Redgrave, Metrology in Short, 3rd Edn (Braunschweig, Germany: EURAMET), 2008.
3. CODATA recommended values of the fundamental physical constants: 2014;Mohr;J. Phys. Chem. Ref. Data,2016
4. BIPM, Quality Infrastructure (QI): Definition, https://www.bipm.org/utils/common/pdf/QI-definition.pdf (assessed 07.20).
5. R.J.C. Brown, The importance of the measurement infrastructure in economic recovery (Teddington UK: NPL), 2020, https://www.npl.co.uk/getattachment/about-us/Who-we-work-with/Government/NPL-evidence-and-analysis/Importance-of-the-measurement-infrastructure-Final.pdf (assessed 07.20).