GRAUTE, Ulrich. Political co-operation and the joint decision trap: Co-operation within the multi-level system of European Spatial Development Policy. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 62, n. 1, p. 18–26, 2004. DOI: 10.1007/BF03183464. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1538. Acesso em: 15 aug. 2026.