Bill, Ralf. “Ehlers, M., Schiewe, J. (2012): Geoinformatik”. Raumforschung und Raumordnung | Spatial Research and Planning 70, no. 6 (December 31, 2012): 557–559. Accessed May 2, 2024. https://rur.oekom.de/index.php/rur/article/view/766.