Knieling, Jörg. “Concepts and Strategic Spatial Development: Placement in Planning Theory and Discussion of the New Concepts for German Spatial Development”. Raumforschung und Raumordnung | Spatial Research and Planning 64, no. 6 (November 30, 2006): 473–485. Accessed April 27, 2024. https://rur.oekom.de/index.php/rur/article/view/1351.