Fricke, Carola. “Metropolitan Regions As a Changing Policy Concept in a Comparative Perspective”. Raumforschung und Raumordnung | Spatial Research and Planning 75, no. 3 (June 30, 2017): 291–305. Accessed May 4, 2024. https://rur.oekom.de/index.php/rur/article/view/457.