LAGEMAN, Bernhard; NEUMANN, Uwe; SCHMIDT, Christoph M. Unified regional planning for the Ruhr conurbation: A model for success?. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 66, n. 1, p. 63–75, 2008. DOI: 10.1007/BF03184047. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1275. Acesso em: 15 may. 2025.