1. Tomorrow's markets. Global trends and their implications for business,2001
2. The two cultures;Snow,1993
3. German Federal Government. Perspektiven für Deutschland. Unsere strategie für eine nachhaltige Entwicklung [Perspectives for Germany. Our strategy for sustainable development]. Berlin; 2001.
4. Monitoring of technology forecasting activities;Holtmannspötter,2001
5. Technological forecasting for decision-making;Martino,1983