Motzkus, Arnd. “The Role of High-Value, Business-Orientated Services in the Development of Metropolitan Regions in Western Germany”. Raumforschung und Raumordnung | Spatial Research and Planning 58, no. 4 (July 31, 2000): 265–275. Accessed August 15, 2026. https://rur.oekom.de/index.php/rur/article/view/1154.