Rüger, Heiko, and Harun Sulak. 2017. “Weekend Commuting of Employees in Germany: Analysis of the Mircocensus 1991 to 2012”. Raumforschung Und Raumordnung | Spatial Research and Planning 75 (5): 413–427. https://doi.org/10.1007/s13147-017-0496-x.