Gnest, Holger, Wolfgang Roggendorf, and Dietrich Fürst. “Tendencies in Spatial Research: Results of an Internet Search”. Raumforschung und Raumordnung | Spatial Research and Planning 58, no. 1 (January 31, 2000): 63–69. Accessed April 28, 2024. https://rur.oekom.de/index.php/rur/article/view/1133.