1. European Commission: ESDP, European Spatial Development Perspective. Towards Balanced and Sustainable Development of the Territory of the European Community, Brussels 1999.
2. See R. J. Barro, X. Sala-i-Martin: Economic Growth, New York 1995, McGraw-Hill; J. Bröcker: Konvergenz in Europa und die Europäische Währungsunion, in: B. Fischer, T. Straubhaar (eds.): Ökonomische Konvergenz in Theorie und Praxis, Baden-Baden 1998, Nomos Verlagsgesellschaft, pp. 105–135; G. Tondl: Convergence After Divergence? Regional Growth in Europe, Wien, New York 2001.
3. The analysis by Straubhaar et al. is one of the rare exceptions in this context. See T. Straubhaar, M. Suhrcke, D. Urban: Divergence — Is it Geography?, HWWA Discussion Paper No. 181, Hamburg 2002.
4. For an analysis of interregional spillovers see M. Funke, A. Niebuhr: Spatial R&D Spillovers and Economic Growth, HWWA Discussion Paper No. 98, Hamburg 2000.
5. See Bundesamt für Bauwesen und Raumordnung: Study Programme on European Spatial Planning, Final Report, Bonn 2001.