5Sustainable urban water management, An international outlook,June 2001, Cecilia Sundberg.
6Harald Hiessl. AKWA-2100, Scenarios of alternative urban water infrastructure systems. Ecosan-Closing the loop in wastewater management and sanitation, Proceedings of international symposium, 89 ～ 94.
7Martin Oldenburg. Experiences with ecusan projects in Germany and Austria. Germany, Ecosan-Closing the loop in wastewater management and sanitation. Proceedings of international symposium, 209～215.
8Development of eco-san systems, Uno Winblad, Sweden, Ecosan-Closing the loop in wastewater management and sanitation. Proceedings of international symposium, 58～ 62.
9The history on Pittsburgh Water and Sewer Authority, http://www. pgh2o. com.
10Ecosan-a holistic approach to material-flow-management in.sanitation, Christine Wemer, GTZ Germany, Ecosan-Closing the loop in wastewater management and sanitation, Proceedings of international symposium, 29 ～ 33.
