Graehl, Sven, Wolf Fichtner, and Otto Rentz. “Regionalisation As a Contribution to Sustainable Development in the Field of Industrial Production: An Analytical Raster for the Identification of Barriers”. Raumforschung und Raumordnung | Spatial Research and Planning 59, no. 1 (January 31, 2001): 29–38. Accessed April 21, 2025. https://rur.oekom.de/index.php/rur/article/view/1197.