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2. World Health Organization (WHO) Guidelines for Drinking-Water Quality, Incorporating 1st and 2nd Addenda, 3rd edn. Recommendations, vol. 1. (2004)
3. United States Environmental Protection Agency (USEPA) 40 CFR ch. 1(7-1-09 Edition) (2009)
4. Council Directive 91/271/EEC concerning urban waste water treatment, pp. 40–52 (1991)
5. Trojanowicz, M.: Advances in flow analysis. Wyley-VHC, Weinheim, Germany (2008)