Regional governance - stimulus for regional sustainable development? : [The Summer Academy in Wuppertal, held from August 25th - 28th 2002 ; two workshops on central issues of "Regional Governance" at the International Conference "Governance and Sustainability - New challenges for the state, business and civil society" in Berlin, held in September 30th and October 1st 2002, organised by the Institute for Ecological Economy Research (IOEW), Berlin/Wuppertal] (2007)