Holz-Rau, C., Heyer, R., Schultewolter, M., Aertker, J., Wachter, I., & Klinger, T. (2022). A transport typology of major German cities. Raumforschung Und Raumordnung | Spatial Research and Planning, 80(2), 137-152. https://doi.org/10.14512/rur.95 (Original work published 2021)