Kunzmann, Klaus R. „Kilper, Heiderose (ed.) (2009): German Annual of Spatial Research and Policy 2009. New Disparities in Spatial Development in Europe“. Raumforschung und Raumordnung | Spatial Research and Planning 68, no. 5 (Oktober 31, 2010): 437–439. Zugegriffen August 15, 2026. https://rur.oekom.de/index.php/rur/article/view/909.