A. Pyschny, E. Wilde, and R. Knippschild, “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”, RuR, vol. 70, no. 6, pp. 531–544, Dec. 2012, doi: 10.1007/s13147-012-0198-3.