KNAPP, Wolfgang; VOLGMANN, Kati. New Economic Poles in the City Regions of North Rhine-Westphalia: Postsuburbanisation and Restructuring of the City. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 69, n. 5, p. 303–317, 2011. DOI: 10.1007/s13147-011-0112-4. Disponível em: https://rur.oekom.de/index.php/rur/article/view/815.. Acesso em: 5 may. 2024.