1. Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Official Journal of the European Communities L 327 (22. 12. 2000).
2. Decision No 2455/2001/EC of the European Parliament and of the Council of 20 November 2001 establishing a list of priority substances in the field of water policy and amending Directive 2000/60/EC. Official Journal of the European Communities L 331 (15. 12. 2001).
3. German Document to the Implementation of the EC Water Framework Directive. LAWA (30. 04. 2003).
4. Dokumentation der wasserwirtschaftlichen Grundlagen – Bestandsaufnahme: Flussgebietseinheit Rhein, Bearbeitungsgebiet/Koordinierungsraum Niederrhein, Arbeitsgebiet Rheingraben-Nord. LUA-NRW, 2004.
5. ES&T Special Report: Priority pollutants: I-a perspective view