Pyschny, A., Wilde, E., & Knippschild, R. (2012). Towards a City Region? Determining How the Inter-Municipal Cooperation on Commercial Land Development in the Region Halle/Leipzig can be Classified as a Form of Regional Governance. Raumforschung Und Raumordnung | Spatial Research and Planning, 70(6), 531–544. https://doi.org/10.1007/s13147-012-0198-3