1. European Commission, Directive 2008/105/EC of the European Parliament and of the Council on environmental quality standards in the field of water policy, amending and subsequently repealing Council Directives 82/176/EEC, 83/513/EEC, 84/156/EEC, 84/491/EEC, 86/280/EEC and amending Directive 2000/60/EC, Offic. J. Eur. Commun. L 348 (2008) 84.
2. AMPS Expert Group, Contributions of the Expert Group on Analysis and Monitoring of Priority Substances to the Water Framework Directive Expert Advisory Forum on Priority Substances and Pollution Control, EU Report EUR 21587 EN, European, Communities, 2005, p. 133.
3. European Commission, WFD-CIS Guidance Document No. 27 Technical Guidance For Deriving Environmental Quality Standards, Office for Official Publications of the European Communities, Luxembourg, 2011, p. 204. Downloadable from: http://circa.europa.eu/Public/irc/env/wfd/library?l=/framework_directive/guidance_documents/tgd-eqs_cis-wfd/_EN_1.0_&a=d.
4. European Commission. WFD-CIS Guidance Document No. 25 Guidance on chemical monitoring of sediment and biota under the Water Framework Directive, Office for Official Publications of the European Communities, Luxembourg, 2010, p. 74. Downloadable from: http://circa.europa.eu/Public/irc/env/wfd/library?l=/framework_directive/guidance_documents/guidance_monitoring/_EN_1.0_&a=d.
5. European Commission, WFD-CIS Guidance Document No. 19 Guidance on Surface Water Chemical Monitoring under The Water Framework Directive, Office for Official Publications of the European Communities, Luxembourg, 2009, p. 130. Downloadable from: http://circa.europa.eu/Public/irc/env/wfd/library?l=/framework_directive/guidance_documents/guidance_monitoringpdf/_EN_1.0_&a=d.