1. CIT Ekologik. LCAiT energy and transport database CIT-3g. Chalmers Industriteknik, Chalmers Sciencepark, Sweden; 2001.
2. Commission of the European Communities. Report from the Commission—Implementation of Council Directive 91/271/EEC of 21 May 1991 Concerning Urban Waste Water Treatment, As Amended by Commission Directive 98/15/EC of 27 February 1998—Summary of the Measures Implemented by the Member States and Assessment of the Information Received Pursuant to Articles 17 and 13 of the Directive. COM/98/0775 final, EUR-Lex.
3. Commission of the European Communities. Report from the Commission to the Council and the European Parliament on the Implementation of Community Waste Legislation—Directive 75/442/EEC on Waste, Directive 91/689/EEC on Hazardous Waste, Directive 75/439/EEC on Waste Oils and Directive 86/278/EEC on Sewage Sludge—for the period 1995–1997. COM/99/0752, EUR-Lex; 2000.
4. The importance of pathogenic organisms in sewage and sewage sludge;Dumontet;J. Air Waste Manage. Assoc.,2001
5. European Environment Agency. Environment in the European Union at the turn of the century—environmental assessment report no. 2, Chapter 3.7. Waste Generation and Management, EEA, Copenhagen, Denmark; 1999.