Holz-Rau, Christian, Christian Holz-Rau, and Kathrin Sicks. 2013. “The City of Short-Distance Trips and Long-Distance Journeys”. Raumforschung Und Raumordnung | Spatial Research and Planning 71 (1): 15–31. https://doi.org/10.1007/s13147-012-0205-8.