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• Attractive public transport through regional co-operation experiences and suggestions from Wroclaw Seifert, Katrin ; Georgi, Birgit (Hrsg.) Dessau : Federal Environment Agency (Umweltbundesamt), [2006]

• Monitoring and evaluation of policy instruments to support renewable electricity in EU member states summary Niederle, Werner (Hrsg.) Dessau : Federal Environment Agency (Umweltbundesamt), November 2006