Kosfeld, Reinhold, and Alexander Werner. “German Labour Markets—New Delineation After the Reforms of German District Boundaries 2007–2011”. Raumforschung und Raumordnung | Spatial Research and Planning 70, no. 1 (February 28, 2012): 49–64. Accessed August 15, 2026. https://rur.oekom.de/index.php/rur/article/view/932.