Adam, Brigitte, and Stefan Fritzsche. “The European City – a Model for Future Urban Development and Its Elements”. DIE ERDE – Journal of the Geographical Society of Berlin 143, no. 1-2 (September 17, 2012): 105–127. Accessed May 8, 2024. https://www.die-erde.org/index.php/die-erde/article/view/25.