M. RUSCHE, Karsten; A. OBERST, Christian. European Metropolitan Regions in Germany – a Regional Economic Evaluation. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 68, n. 4, p. 243–254, 2010. DOI: 10.1007/s13147-010-0036-4. Disponível em: https://rur.oekom.de/index.php/rur/article/view/888.. Acesso em: 21 apr. 2025.