Priebs, Axel, and Rainer Wehrhahn. “City-Regional Cooperation in Smaller Metropolitan Areas. Transdisciplinary Research on Strategy Development in the City Region of Kiel (Germany)”. DIE ERDE – Journal of the Geographical Society of Berlin 154, no. 1-2 (November 10, 2023): 62–68. Accessed July 21, 2024. https://die-erde.de/index.php/die-erde/article/view/666.