Geys, Benny, Friedrich Heinemann, and Alexander Kalb. “Local Government Efficiency in German Municipalities”. Raumforschung und Raumordnung | Spatial Research and Planning 71, no. 4 (August 31, 2013): 283–293. Accessed March 23, 2025. https://rur.oekom.de/index.php/rur/article/view/687.