1. Cities and Sustainability, Background to a Research Programme;Ekins,1993
2. Sustainable Cities;Haughton,1994
3. Sustainability and Technology;Brooks,1992
4. Urban Drainage in the 21st Century: Assessment of New Technology on the Basis of Global Material Flows;Beck;Water Science and Technology,1994
5. The Simultaneous Chemical Precipitation of Ammonium and Phosphate in the Form of Magnesium-ammonium-phosphate;Schulze-Rettmer;Water Science and Technology,1991