Eßer, Anke, and David Schmedding. 2005. “Tradeable Permits As a Steering Instrument for Goods Traffic in Ecologically Sensitive Areas: The Case of the Brenner Motorway”. Raumforschung Und Raumordnung | Spatial Research and Planning 63 (6): 400–411. https://doi.org/10.1007/BF03182969.