KRAMAR, Hans. Economic convergence on different spatial levels: the conflict between cohesion and growth. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 64, n. 1, p. 18–27, 2006. DOI: 10.1007/BF03183103. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1413. Acesso em: 15 aug. 2026.