Bovet, Jana, Kilian Bizer, Ralph Henger, Katrin Ostertag, and Stefan Siedentop. 2013. “Tradable Planning Permits: From an Academic Discourse via a Pilot Project to Planning Practice?”. Raumforschung Und Raumordnung | Spatial Research and Planning 71 (6): 497–507. https://doi.org/10.1007/s13147-013-0255-6.