Kaltenbrunner, Robert. “The Countryside and the Encroaching Urban Fringe: Housing and Suburbanisation: Is This Nexus Now Out of Control?”. Raumforschung Und Raumordnung | Spatial Research and Planning, vol. 61, no. 5, Sept. 2003, pp. 319–333, https://doi.org/10.1007/BF03183876.