1. Directive 2009/23/EC of the European Parliament and of the Council of 23 April 2009 on non-automatic weighing instruments. Official Journal of the European Union, 16 May 2009; L122/6-27. http://europa.eu
2. Marriott JF, Wilson KA, Langley CA, Belcher D (2012) Pharmaceutical compounding and dispensing, 2nd edn. Pharmaceutical Press, London
3. Schnaare RL, Prince SJ (2012) Metrology and pharmaceutical calculations. In: Felton LA (ed) Remington essentials of pharmaceutics. Pharmaceutical Press, London, pp 101–132
4. Working Group 1 of the Joint Committee for Guides in Metrology (JCGM/WG1) (2008) Guide to the expression of uncertainty in measurement. Evaluation of measurement data. Sèvres Cedex (F); Bureau International des Poids et Mesures (BIPM)/Joint Committee for Guides in Metrology (JCGM); 100. www.bipm.org
5. Working Group 1 of the Joint Committee for Guides in Metrology (JCGM/WG1) (2020). Guide to the expression of uncertainty in measurement – Part 6: Developing and using measurement models. Joint Committee for Guides in Metrology (JCGM). JCGM GUM-6: 2020. www.bipm.org