J. Bovet, K. Bizer, R. Henger, K. Ostertag, and S. Siedentop, “Tradable Planning Permits: From an Academic Discourse via a Pilot Project to Planning Practice?”, RuR, vol. 71, no. 6, pp. 497–507, Dec. 2013, doi: 10.1007/s13147-013-0255-6.