1. Department of Public Finance, University of Innsbruck, Innsbruck, Austria
2. Institute of Geography, University of Innsbruck, Innsbruck, Austria
3. Department of Geography & Environmental Management, University of Waterloo, Waterloo, Canada
4. Observatori de la Sostenibilitat d’Andorra, Sant Julià de Lòria, Andorra
5. Vestlandsforsking, Sogndal, Norway