KARL, Helmut. EU-level control of national regional development aid. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 60, n. 3-4, p. 209–218, 2002. DOI: 10.1007/BF03183054. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1599.. Acesso em: 3 may. 2024.