Balke, Jan, and Mario Reimer. “Region Building in the Shadow of the Metropolitan Discourse. The Case Study of Südwestfalen (Southern Westphalia)”. Raumforschung und Raumordnung | Spatial Research and Planning 74, no. 4 (August 31, 2016): 293–305. Accessed May 3, 2024. https://rur.oekom.de/index.php/rur/article/view/516.