Eichhorn, S., Diller, C., & Pehlke, D. (2023). The Development of the Regulatory Intensity of German Regional Plans from 1985 to 2017. An Empirical Contribution to the Discussion on the Loss of Importance of Spatial Planning. Raumforschung Und Raumordnung | Spatial Research and Planning, 81(3), 207-224. https://doi.org/10.14512/rur.941 (Original work published 2023)