Flicke, Dietrich, Kurt Nelius, Ulrich Reinheckel, and Marie-Luise Sandau. “Infill Management in Berlin: The Cadastral Register of Vacant Building Plots in Berlin in the Internet”. Raumforschung und Raumordnung | Spatial Research and Planning 60, no. 5-6 (September 30, 2002): 377–384. Accessed September 10, 2026. https://rur.oekom.de/index.php/rur/article/view/1631.