1.
Economisch belang van de Belgische havens: Vlaamse zeehavens, Luiks havencomplex en haven van Brussel – Verslag 2006
La consommation privée en Belgique
Economic Importance of Belgian Transport Logistics
Economic Importance of Air Transport and Airport Activities in Belgium
Economic Importance of Air Transport and Airport Activities in Belgium – Report 2009
Economic importance of air transport and airport activities in Belgium – Report 2012
The Effectiveness of Dutch Municipal Recycling Policies