Schiller, Georg, Andreas Blum, and Holger Oertel. 2018. “The Relevance of Smaller Municipalities and Small-Scale Potential for Infill Development. A Quantitative Monitoring Using the Example of Germany”. Raumforschung Und Raumordnung | Spatial Research and Planning 76 (5): 461–471. https://doi.org/10.1007/s13147-018-0534-3.