1. Vision and creativity–challenge for city regions;Ache;Futures,2000
2. Sustainability: a cross-disciplinary concept for social transformation;Becker,1997
3. Measuring sustainability–learning from doing;Bell,2003
4. Indicators for sustainable development: theory, method, applications;Bossel,1999
5. Computer based methods for the analysis and interpretation of personal construct systems;Bringmann,1992