The Directorate General for Research of the European Parliament (EP) launched - on request of the Committee of the Environment, Public Health and Consumer Protection - an external study on "Effluent Charging Systems in the EU Member States". This study focusses on economic instruments for regulating direct discharges of effluents into natural waters.

Palinkas, Peter (Ed.) 2002: Briefing ENVI 509 EN on the results of the workshop of 8 November 2001on "Effluent Charging Systems in the EU Member States". Luxembourg.

Palinkas, Peter (Ed.) 2001: Effluent Charging Systems in the EU Member States – Working Paper. Luxembourg.