Windelberg, J. et al. 2004. Online dialog on town planning: The North-South divide: Common features and differences identified after an online course on “Basics of Urban Development and Town Planning (BUTTOP)”. Raumforschung und Raumordnung | Spatial Research and Planning. 62, 1 (Jan. 2004), 50–57. DOI:https://doi.org/10.1007/BF03183467.