Herfert, G. “Between Gentrification and Downward Spiral: Socio-Spatial Differentiation in Housing Quarters of Large City Regions in Saxony at the End of the 1990’s”. Raumforschung Und Raumordnung | Spatial Research and Planning, vol. 61, no. 3, Mar. 2003, pp. 170–184, doi:10.1007/BF03183806.