Greiving, S. et al. 2015. Comparative Study on the Central Place Concepts of the GermanLänder and Recommendations for their Further Development. Raumforschung und Raumordnung | Spatial Research and Planning. 73, 4 (Aug. 2015), 285–297. DOI:https://doi.org/10.1007/s13147-015-0357-4.