Nadler, Robert, Knut Petzold, and Robert Schönduwe Diplom-Geograph. “Doing Online Surveys in Socio-Scientific Regional Studies: Issues and Experiences”. Raumforschung und Raumordnung | Spatial Research and Planning 73, no. 3 (June 30, 2015): 203–217. Accessed August 15, 2026. https://rur.oekom.de/index.php/rur/article/view/593.