[1]
Heiland, S. and Tischer, M. 2004. The modular design of sustainability-indicator systems: An approach towards improving the effectiveness of indicator systems in local-authority practice. Raumforschung und Raumordnung | Spatial Research and Planning. 62, 1 (Jan. 2004), 27–35. DOI:https://doi.org/10.1007/BF03183465.